#include <bits/stdc++.h>

using namespace std;
typedef long long ll;


int main(){
    int a, b, c, d, e, ans;
    cin >> a >> b >> c >> d;
    if (d == 10)
        cout << "Impossible" << endl;
    else{
        cout << "Possible" << endl;
        e = a + b;
        ans = 0;
        for(int i = 0; i < 8; i++){
            c = min(100, e);
            ans += pow(2,i)*100*c;
            e -= c;
        }
        for(int i = 0; i < 8; i++){
            c = min(100, b);
            ans -= pow(2,i)*50*c;
            b -= c;
        }
        cout << ans << endl;
    }
    
    
    return 0;

}