#include <bits/stdc++.h>

using namespace std;

int main() {
    int K = 0;
    cin >> K;
    float s = 0;
    for (int n = 1;; n++) {
        s += 1 / (1.0 * n);
        if (s > K) {
            cout << n << endl;
            break;
        }
    }
    return 0;
}