Submission #779852

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Source Code Expand

#define _USE_MATH_DEFINES
#include <iostream>
#include <queue>
#include <vector>
#include <math.h>
#include <algorithm>
#include <iomanip>
#include <string>
#include <stack>
#include <cctype>
#include <cstdlib>
#include <string.h>
#include <utility>
#include <cstdio>
using namespace std;

#define INF (1 << 20)
#define EPS (1e-10)
#define EQ(a,b) (fabs((a)-(b)) < EPS)

#define ll long long
#define LL long long


int main() {
	ll A, B, K, L;
	cin >> A >> B >> K >> L;
	ll amari = K % L;
	ll sum = K / L * B;
	if (B <= amari * A) sum += B;
	else sum += amari * A;
	cout << sum << endl;
	return 0;
}

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