#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

int main(){
    cout<<setprecision(15);
    double k,ans=0;
    cin>>k;
    for(int n=1;n<=10;n++){
        int cnt=n;
        double den=1;
        while(cnt) {den*=n;cnt--;}
        ans+=sin(n*k)/den;
    }
    cout<<ans<<endl;
    return 0;
}