#include <random>
#include <iostream>
constexpr int BASE = 100000;
constexpr double PLANE_HIT = 0.2;
constexpr double TARGET_HIT = 0.3;

int gen_value()
{
    static std::random_device rd;
    static std::uniform_int_distribution<int> dist(1, 1 * BASE);
    static std::mt19937 engine(rd());
    return dist(engine);
}

bool check(double prob)
{
    return gen_value() < prob * BASE;
}

bool test()
{
    int value = gen_value();
    int container_idx = 0;
    if (value > 1.0/3 * BASE && value < 2.0/3 * BASE)
    {
        container_idx = 1;
    }
    else if (value > 2.0/3 * BASE)
    {
        container_idx = 2;
    }
    //std::cout << "Container id: " << container_idx << '\n';
    int planes_left = 3;
    while (planes_left--) {
        //std::cout << "Plane #" << 3 - planes_left << " is attacking\n";
        if (check(PLANE_HIT))
        {
            // container destroyed
            //std::cout << "Plane #" << 3 - planes_left << " was destroyed\n";
            if (container_idx-- == 0) {
                //std::cout << "Container was destroyed\n";
                return false;
            }
        }
        else
        {
            // if target destroyed
            if (check(TARGET_HIT)) {
                //std::cout << "Plane #" << 3 - planes_left << " has destroyed the target\n";
                return true;
            }
        }
    }
    return false;
}

int main()
{
    const int probes = 1000000;
    int i = probes;
    int times = 0;
    while (i--) {
        if (test()) {
            times++;
        }
    }
    int return_value = times / (double)probes * 100;
    std::cout << return_value;
    return return_value;
}