#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  int a, b, c, d;
  cin >> a >> b >> c >> d;
  if (d < 10) {
    cout << "Possible" << endl;
    int ans = 0;
    rep(i, b) ans += 50 * (1 << (i / 100));
    rep(i, a) ans += 100 * (1 << ((b + i) / 100));
    cout << ans << endl;
  }
  else {
    cout << "Impossible" << endl;
  }
  return 0;
}