#include<bits/stdc++.h>
using namespace std;

int main() {
    int k; double sn = 0;
    cin >> k;
    for (int n = 1;; n++) {
        sn += 1.0 / n;
        if (sn > k) {
            cout << n;
            break;
        }
    }
    return 0;
}