#include <bits/stdc++.h>
using namespace std;
#include <boost/multiprecision/cpp_int.hpp>
typedef boost::multiprecision::cpp_int mp;

int main(){
    double k,ans=0;
    cin>>k;
    for(double i=1;i<100;i++){
        ans+=sin(k*i)/pow(i,i);
    }
    printf("%.8f",ans);
}