#include <cstring>
#include <iostream>
#include <cmath>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <iomanip>

using namespace std;

int main() {
    int k;
    cin >> k;
    double sum = 0;
    int cnt = 0;
    while(sum <= k) {
        cnt++;
        sum += 1.0
 
 / cnt;
    } 
    cout << cnt << endl;
}

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