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

int main() {
  int A, B, C, D;
  cin >> A >> B >> C >> D;
  if (D >= 10) return cout << "Impossible" << "\n", 0;
  else cout << "Possible" << "\n";
  C = 0, D = 0;
  while (B--) D += 50 * 1 << C / 100, C++;
  while (A--) D += 100 * 1 << C / 100, C++;
  cout << D << "\n";
}