#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); i++)
#define repi(i, a, b) for (int i = (a); i < (b); i++)
#define all(a) (a).begin(), (a).end()

using namespace std;
using i32 = int;
using i64 = long long;
using f64 = double;
using vi32 = vector<i32>;
using vvi32 = vector<vi32>;
using vi64 = vector<i64>;
using vvi64 = vector<vi64>;

template<typename T> inline bool amin(T &x, T y) { if (y < x) { x = y; return true; } return false; }
template<typename T> inline bool amax(T &x, T y) { if (x < y) { x = y; return true; } return false; }

int twice(int combo) {
  if (combo == 0) return 1;
  return (int) pow(2, (combo - 1) / 100);
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int a, b, c, d;
  cin >> a >> b >> c >> d;
  if (d >= 10) {
    cout << "Impossible" << endl;
    return 0;
  }
  int ans = 0;
  int combo = 0;
  while (b) {
    while (b / 100) {
      combo += 100;
      ans += 100 * 50 * twice(combo);
      b -= 100;
    }
    combo += b;
    ans += b * 50 * twice(combo);
    b = 0;
  }
  i32 rest = 100 - combo % 100;
  rest = rest == 100 ? 0 : rest;
  amin(rest, a);
  ans += rest * 100 * twice(combo);
  combo += rest;
  a -= rest;
  while (a) {
    while (a / 100) {
      combo += 100;
      ans += 100 * 100 * twice(combo);
      a -= 100;
    }
    combo += a;
    ans += a * 100 * twice(combo);
    a = 0;
  }
  cout << "Possible" << endl;
  cout << ans << endl;
  return 0;
}