#include <iostream>
#include <random>

bool left(double x1, double y1, double x2, double y2, double x, double y){
    double vx,vy,wx,wy;
    vx = x2-x1; vy = y2-y1;
    wx = x-x1; wy = y-y1;
    return (vx*wy-wx*vy)>0;
}

bool insidetriangle(double x1, double y1, double x2, double y2, double x3, double y3, double x, double y){
    return (left(x1,y1,x2,y2,x,y) && left(x2,y2,x3,y3,x,y) && left(x3,y3,x1,y1,x,y)) ||
           (!left(x1,y1,x2,y2,x,y) && !left(x2,y2,x3,y3,x,y) && !left(x3,y3,x1,y1,x,y));
}


int main() {
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_real_distribution<> dis(0, 1);
    double random_number = dis(gen);
    int K = 0;
    int N = 10000000;
    for (int i = 0; i < N ; ++i) {
        double x1,y1,x2,y2,x3,y3,x4,y4,x5,y5,x6,y6;
        x1 = dis(gen);
        x2 = dis(gen);
        x3 = dis(gen);
        x4 = dis(gen);
        x5 = dis(gen);
        x6 = dis(gen);
        y1 = dis(gen);
        y2 = dis(gen);
        y3 = dis(gen);
        y4 = dis(gen);
        y5 = dis(gen);
        y6 = dis(gen);
        if (insidetriangle(x1,y1,x2,y2,x3,y3,x4,y4) &&
            insidetriangle(x1,y1,x2,y2,x3,y3,x5,y5) &&
            insidetriangle(x1,y1,x2,y2,x3,y3,y6,y6))
            K++;
    }
    std::cout << (K*1.0)/(N*1.0) << std::endl;
    return 0;
}