#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <cmath>
#include <bitset>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
#include <complex>
#include <unordered_map>
#include <unordered_set>
#include <random>
#include <cassert>
#include <fstream>
#include <utility>
#include <functional>
#include <time.h>
#include <stack>
#include <array>
#define popcount __builtin_popcount
using namespace std;
using ll=long long;
typedef pair<int, int> P;

int main()
{
    int k; cin>>k;
    double ans=0;
    for(int i=1; i<=100; i++){
        double x=sin((double)k*i);
        double y=pow((double)i, (double)i);
        ans+=x/y;
    }
    printf("%.7lf\n", ans);
    return 0;
}