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

int main() {
  int a, b, c, d;
  cin >> a >> b >> c >> d;
  if (d == 10) {
    puts("Impossible");
    return 0;
  }
  puts("Possible");
  int cnt = 0, ans = 0;
  while (b > 0) {
    cnt++;
    b--;
    ans += 50 * pow(2, ((cnt - 1) / 100));
  }
  while (a > 0) {
    cnt++;
    a--;
    ans += 100 * pow(2, ((cnt - 1) / 100));
  }
  cout << ans << endl;
  return 0;
}