#include <iostream>
#include <vector>
#include <string>
#include <cmath>
using namespace std;
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int k;
    cin >> k;
    double ans = 0;
    for(int i = 1; i <= 10; i++){
        double n = (double)i;
        ans += sin((double)(k * i)) / pow((double)i, n);
    }
    printf("%.10lf\n", ans);
}