#include <iostream>

void solve() {
    int a, b, c, d;
    std::cin >> a >> b >> c >> d;

    if (d >= 10) {
        std::cout << "Impossible" << std::endl;
        return;
    }
    std::cout << "Possible" << std::endl;

    int score = 0, combo = 0;
    while (b--) {
        score += 50 * (1 << (combo / 100));
        ++combo;
    }
    while (a--) {
        score += 100 * (1 << (combo / 100));
        ++combo;
    }

    std::cout << score << std::endl;
}

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

    solve();

    return 0;
}