Submission #61790377

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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef vector<ll> vll;
typedef vector <pair<ll, ll>> vp;
typedef pair<ll, ll> pll;
typedef map <ll, ll> mll;
typedef set <ll> sll;
#define pb push_back
#define ff first
#define ss second
#define str to_string
#define all(x) (x).begin(), (x).end()
#define print(x) for (auto i : x) cout << i << ' '; cout << '\n';
#define FastIO ios_base::sync_with_stdio(false); cin.tie(NULL);
#define TxtIO freopen("input.txt","r",stdin); freopen("output.txt","w",stdout);
const ll maxn = 2e5+5;
 
 
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#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;
typedef vector<ll> vll;
typedef vector <pair<ll, ll>> vp;
typedef pair<ll, ll> pll;
typedef map <ll, ll> mll;
typedef set <ll> sll;
#define pb push_back
#define ff first
#define ss second
#define str to_string
#define all(x) (x).begin(), (x).end()
#define print(x) for (auto i : x) cout << i << ' '; cout << '\n';
#define FastIO ios_base::sync_with_stdio(false); cin.tie(NULL);
#define TxtIO freopen("input.txt","r",stdin); freopen("output.txt","w",stdout);

const ll maxn = 2e5+5;
const ll mod = 1e9+7;
const ll inf = 2e18;

ll pw(ll a, ll b, ll M = mod) {ll ans = 1; for (; b; a = ((a * a) % M), b >>= 1) if (b & 1) ans = (ans * a) % M; return ans;}

ll t, n;
string s;

int main() {
    FastIO

    cin >> n;

    ll i = 2;
    while (i < n) {
        n /= i;
        i++;
    }

    cout << i << '\n';

    return 0;
}

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