#include <iostream>
#include <cmath>

using namespace std;

double binomialCoefficients(double alpha, int k);

int main() {
    int N;
    cin >> N;
    
    double x_i[N];
    for(int i = 0; i < N; i++){
    	cin >> x_i[i];
    	if(x_i[i] > 1) x_i[i] = 1/x_i[i];
    	
    	double result = 0;
    	for(int j = 0; j < 100; j++){
    		double buff = 0;
    		for(int k = 0; k < i; k++ ) buff += pow(x_i[k] - 1, j);
    		
    		result += binomialCoefficients(0.5, j) * buff;
    	}
    	
    	cout << result << endl;
    }
    
    return 0;
}

double binomialCoefficients(double alpha, int k){
	double result = 1;
	for(int i = 0; i < k; i++) result *= (alpha - k)/(k + 1);
	
	return result;
}