/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2020.10.30 21:41:56
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

int main() {
    ll k;cin >> k;
    double ans = 0;
    for (int i = 1; i < 100; i++) {
        ans += sin(k*i) / pow(i,i);
    }
    printf("%.10f\n",ans);
    return 0;
}