#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)

int main(){
  double k;
  cin>>k;
  double ans=0;
  for (int i=1;i<=10;i++)ans+=(double)sin(k*i)/pow(i,i);
  cout<<fixed<<setprecision(12)<<ans<<endl;
  return 0;
}