import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class Main {
public static void main(String[] args) {
InputStream inputStream = System.in;
OutputStream outputStream = System.out;
MyInput in = new MyInput(inputStream);
PrintWriter out = new PrintWriter(outputStream);
TaskX solver = new TaskX();
solver.solve(1, in, out);
out.close();
}
static int INF = 1 << 30;
static long LINF = 1L << 55;
static int MOD = 1000000007;
static int[] mh4 = { 0, -1, 1, 0 };
static int[] mw4 = { -1, 0, 0, 1 };
static int[] mh8 = { -1, -1, -1, 0, 0, 1, 1, 1 };
static int[] mw8 = { -1, 0, 1, -1, 1, -1, 0, 1 };
static class TaskX {
int h, w;
char[][] s;
final int B = 0, W = 1;
public void solve(int testNumber, MyInput in, PrintWriter out) {
h = in.nextInt(); w = in.nextInt();
s = new char[h][w];
DisjointSet set = new DisjointSet(h * w);
List<P> list = new ArrayList<>();
for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) {
s[i][j] = in.nextChar();
if (s[i][j] == '#') list.add(new P(i, j));
for (int k = 0; k < 4; k++) {
int mh = i + mh4[k];
int mw = j + mw4[k];
if (isInside(mh, mw) && ((s[i][j] == '#' && s[mh][mw] == '.') || (s[i][j] == '.' && s[mh][mw] == '#'))) {
set.unite(f(i, j), f(mh, mw));
}
}
}
}
long ans = 0;
long[] memo = new long[h * w];
Arrays.fill(memo, -1);
boolean[][] used = new boolean[h][w];
for (P p : list) {
int root = set.root(f(p.h, p.w));
if (memo[root] != -1) {
ans += memo[root];
continue;
}
ans += memo[root] = dfs(p.h, p.w, used, B);
}
out.println(ans);
}
int dfs(int nh, int nw, boolean[][] used, int stat) {
used[nh][nw] = true;
int ret = 0;
for (int i = 0; i < 4; i++) {
int mh = nh + mh4[i];
int mw = nw + mw4[i];
if (isInside(mh, mw) && !used[mh][mw]) {
if (stat == B && s[mh][mw] == '.') {
ret += dfs(mh, mw, used, W) + 1;
}
if (stat == W && s[mh][mw] == '#') {
ret += dfs(mh, mw, used, B);
}
}
}
return ret;
}
int f(int i, int j) {
return i * w + j;
}
boolean isInside(int i, int j) {
return 0 <= i && i < h && 0 <= j && j < w;
}
}
public static class DisjointSet {
int[] p, rank, cnt;
public DisjointSet(int size) {
p = new int[size];
rank = new int[size];
cnt = new int[size];
for (int j = 0; j < size; j++) {
makeSet(j);
}
}
private void makeSet(int x) {
p[x] = x;
rank[x] = 0;
cnt[x] = 1;
}
public int root(int x) {
return p[x] == x ? x : root(p[x]);
}
private void link(int x, int y) {
if (rank[x] > rank[y]) {
p[y] = x;
} else if (rank[x] < rank[y]) {
p[x] = y;
} else if (rank[x] == rank[y]) {
p[x] = y;
rank[y]++;
}
if (x != y) {
cnt[x] = cnt[y] += cnt[x];
}
}
public void unite(int x, int y) {
link(root(x), root(y));
}
public boolean same(int x, int y) {
return root(x) == root(y);
}
public int getSize(int x) {
return cnt[root(x)];
}
}
static class P {
int h, w;
public P(int h, int w) {
super();
this.h = h;
this.w = w;
}
@Override
public String toString() {
return "P [h=" + h + ", w=" + w + "]";
}
}
static class MyInput {
private final BufferedReader in;
private static int pos;
private static int readLen;
private static final char[] buffer = new char[1024 * 8];
private static char[] str = new char[500 * 8 * 2];
private static boolean[] isDigit = new boolean[256];
private static boolean[] isSpace = new boolean[256];
private static boolean[] isLineSep = new boolean[256];
static {
for (int i = 0; i < 10; i++) {
isDigit['0' + i] = true;
}
isDigit['-'] = true;
isSpace[' '] = isSpace['\r'] = isSpace['\n'] = isSpace['\t'] = true;
isLineSep['\r'] = isLineSep['\n'] = true;
}
public MyInput(InputStream is) {
in = new BufferedReader(new InputStreamReader(is));
}
public int read() {
if (pos >= readLen) {
pos = 0;
try {
readLen = in.read(buffer);
} catch (IOException e) {
throw new RuntimeException();
}
if (readLen <= 0) {
throw new MyInput.EndOfFileRuntimeException();
}
}
return buffer[pos++];
}
public int nextInt() {
int len = 0;
str[len++] = nextChar();
len = reads(len, isSpace);
int i = 0;
int ret = 0;
if (str[0] == '-') {
i = 1;
}
for (; i < len; i++)
ret = ret * 10 + str[i] - '0';
if (str[0] == '-') {
ret = -ret;
}
return ret;
}
public long nextLong() {
int len = 0;
str[len++] = nextChar();
len = reads(len, isSpace);
int i = 0;
long ret = 0;
if (str[0] == '-') {
i = 1;
}
for (; i < len; i++)
ret = ret * 10 + str[i] - '0';
if (str[0] == '-') {
ret = -ret;
}
return ret;
}
public char nextChar() {
while (true) {
final int c = read();
if (!isSpace[c]) {
return (char) c;
}
}
}
public String nextString() {
return new String(nextChars());
}
public char[] nextChars() {
int len = 0;
str[len++] = nextChar();
len = reads(len, isSpace);
return Arrays.copyOf(str, len);
}
int reads(int len, boolean[] accept) {
try {
while (true) {
final int c = read();
if (accept[c]) {
break;
}
if (str.length == len) {
char[] rep = new char[str.length * 3 / 2];
System.arraycopy(str, 0, rep, 0, str.length);
str = rep;
}
str[len++] = (char) c;
}
} catch (MyInput.EndOfFileRuntimeException e) {
}
return len;
}
public int[] nextIntArray(final int n) {
final int[] res = new int[n];
for (int i = 0; i < n; i++) {
res[i] = nextInt();
}
return res;
}
public int[] nextIntArray1Index(final int n) {
final int[] res = new int[n + 1];
for (int i = 1; i < n + 1; i++) {
res[i] = nextInt();
}
return res;
}
public int[] nextIntArrayDec(final int n) {
final int[] res = new int[n];
for (int i = 0; i < n; i++) {
res[i] = nextInt() - 1;
}
return res;
}
public long[] nextLongArray(final int n) {
final long[] res = new long[n];
for (int i = 0; i < n; i++) {
res[i] = nextLong();
}
return res;
}
public long[] nextLongArray1Index(final int n) {
final long[] res = new long[n + 1];
for (int i = 1; i < n + 1; i++) {
res[i] = nextLong();
}
return res;
}
public long[] nextLongArrayDec(final int n) {
final long[] res = new long[n];
for (int i = 0; i < n; i++) {
res[i] = nextLong() - 1;
}
return res;
}
public double nextDouble() {
return Double.parseDouble(nextString());
}
public double[] nextDoubleArray(int n) {
double[] res = new double[n];
for (int i = 0; i < n; i++) {
res[i] = nextDouble();
}
return res;
}
static class EndOfFileRuntimeException extends RuntimeException {
}
}
}