#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
using namespace std;
typedef long long ll;
int INF = (1LL << 30) - 1;
int MOD = 1e9+7;
main(){
    int A,B,C,D;
    cin >> A >> B >> C >> D;
    if(D >= 10){
        cout << "Impossible" << endl;
        return 0;
    }
    cout << "Possible" << endl;
    int score = 0, combo = 0;
    while(B){
        score += 50 * (1 << (combo / 100));
        combo ++;
        B --;
    }
    while(A){
        score += 100 * (1 << (combo / 100));
        combo ++;
        A --;
    }
    cout << score << endl;
}