#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int A,B,C,D; cin >> A >> B >> C >> D;
    if(D >= 10) {
        cout << "Impossible" << endl;
    } else {
        cout << "Possible" << endl;
        int cnt = 0, prod = 1, ans = 0;
        for(int b = 1; b <= B; b++) {
            if(cnt != 0 && cnt % 100 == 0) prod *= 2;
            cnt++;
            ans += prod * 50;
        }
        for(int a = 1; a <= A; a++) {
            if(cnt != 0 && cnt % 100 == 0) prod *= 2;
            cnt++;
            ans += prod * 100;
        }
        cout << ans << endl;
    }
}