#include <iostream>
using namespace std;
int main()
{
    double sum; // Use double for sum to handle fractions
    int n, k;
    cin >> k;
    n = 1;
    sum = 0.0;
    while (sum <= k)
    {
        sum = sum + 1.0 / n; // Use 1.0 to ensure floating-point division
        n++;
    }
    cout << n - 1 << endl; // n is incremented one extra time in the loop
    return 0;
}