#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;

int main(){
    int a, b, c, d, ans = 0;
    cin >> a >> b >> c >> d;
    if(d == 10){
        cout << "Impossible" << endl;
        return 0;
    }
    cout << "Possible" << endl;
    int k = 1;
    while(b > 100){
        ans += min(b, 100) * 50 * k;
        b -= 100;
        k <<= 1;
    }
    ans += b * 50 * k + min(a, 100 - b) * 100 * k;
    a -= 100 - b;
    k <<= 1;
    while(a > 0){
        ans += min(a, 100) * 100 * k;
        a -= 100;
        k <<= 1;
    }
    cout << ans << endl;
    return 0;
}