#include <bits/stdc++.h>

using namespace std;
int k, ans;
int main() {
    cin >> k;
    for (double Sn = 0; Sn <= k; ans++, Sn += 1.0 / ans)
        ;
    //for (double Sn = 0; Sn <= k; Sn += 1.0 / ans) ans++;
    cout << ans;
    return 0;
}