#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

int main() {
  int A, B, C, D;
  cin >> A >> B >> C >> D;
  long long ans = 0;
  if (D >= 10) {
    cout << "Impossible" << endl;
    return 0;
  }
  cout << "Possible" << endl;
  int cnt = 0;
  long long two = 1;
  for (int i = 0; i < B; i++) {
    ans += 50 * two;
    cnt++;
    if (cnt % 100 == 0) two *= 2;
  }
  for (int i = 0; i < A; i++) {
    ans += 100 * two;
    cnt++;
    if (cnt % 100 == 0) two *= 2;
  }
  cout << ans << endl;
}