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

int main() {
  int a, b, c, d;
  cin >> a >> b >> c >> d;
  if (d == 10) {
    puts("Impossible");
  } else {
    puts("Possible");
    ll ans = 0;
    ll cur = 1;
    for (int i = 1; i <= b; ++i) {
      ans += cur * 50;
      if (i % 100 == 0) {
	cur *= 2;
      }
    }

    for (int i = b + 1; i <= b + a; ++i) {
      ans += cur * 100;
      if (i % 100 == 0) cur *= 2;
    }
    cout << ans << '\n';
  }
  return 0;
}