#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("Yes");}else{puts("No");}
#define MAX_N 200005

int main() {
    int a,b,c,d;
    cin >> a >> b >> c >> d;

    int ans = 0;

    if(d == 10){
        cout << "Impossible" << endl;
        return 0;
    }
    cout << "Possible" << endl;
    int cnt = 0;
    while(a || b){
        
        if(b){
            ans += 50 * pow(2,cnt/100);
            b--;
        }else if(a){
            ans += 100 * pow(2, cnt/100);
            a--;
        }
        cnt++;
    }

    cout << ans << endl;
    return 0;
}