#include <bits/stdc++.h>
using namespace std;

int main(){
  int a, b, c, d;
  cin >> a >> b >> c >> d;
  if(d >= 10){
    cout << "Impossible" << endl;
    return 0;
  }


  int combo = 0;
  int kasan = 1;
  int ans = 0;
  for(int i = 0;i < b;i++){
    ans += 50 * kasan;
    combo++;
    if(combo % 100 == 0) kasan *= 2;
  }

  for(int i = 0;i < a;i++){
    ans += 100 * kasan;
    combo++;
    if(combo % 100 == 0) kasan *= 2;
  }

  cout << "Possible" << endl;
  cout << ans << endl;

  return 0;
}