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

double eval(double x, int N) {
    return exp(cos(x / N));
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int T; cin >> T;
    double mx = 1/(exp(1) * M_PI * M_PI);
    cout << setprecision(24);
    while(T--) {
        int N; cin >> N;
        int blocks = 200;
        double dx = mx / blocks;
        double ans = 0.0;
        for(double x = 0; x < mx; x += dx) {
            double mid = (x + x + dx) / 2;
            ans += eval(mid, N) * dx;
        }
        cout << ans << "\n";
    }
}