#include <iostream>
using namespace std;
int main(){
    int a,b,c,d;cin>>a>>b>>c>>d;
    if(d > 9){
        cout << "Impossible" << endl;
    }else{
        long long ans = 0;
        long long nw = 1;
        while(a){
            if(b >= 100){
                ans += nw*(50*100);
                b-=100;
            }else if(a+b >= 100){
                ans += nw*(b*50+(100-b)*100);
                a -= (100-b);
                b = 0;
            }else{
                ans += nw*(b*50+a*100);
                break;
            }
            nw *= 2;
        }
        cout << "Possible" << endl;
        cout << ans << endl;
    }
}