#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int a, b, c, d;
  cin >> a >> b >> c >> d;

  if (d >= 10)
    cout << "Impossible" << endl;
  else {
    cout << "Possible" << endl;
    int score = 0;
    int base = 1;
    int combo = 0;
    
    REP (i, b) {
      if (combo > 0 && combo % 100 == 0)
        base *= 2;
      score += 50 * base;
      ++combo;
    }

    REP (i, a) {
      if (combo > 0 && combo % 100 == 0)
        base *= 2;
      score += 100 * base;
      ++combo;
    }

    cout << score << endl;
  }

  
  return 0;
}