#include<math.h>
#pragma warning(disable:4996) 
int main()
{
    int k, n = 1;
    double sum = 0;
    scanf("%d", &k);
    do
    {
        sum = sum + 1.0 / n;
        n++;
    } while (!(sum > k));
    printf("%d", n-1);
    return 0;
}