#include <bits/stdc++.h>
using namespace std;

int main(){
    int T;
    cin>>T;
    for(int i=0;i<T;i++){
        double N;
        cin>>N;
        double e=exp(1);
        double π=asin(1)*2;
        double a=1/e/π/π/N;
        printf("%.10f", N*e*(a-a*a*a/6+a*a*a*a*a/30-31*pow(a,7)/5040));
        cout<<endl;
    }
    
}