#include <cstdio>

int main() {
  int A, B, C, D;
  scanf("%d %d %d %d", &A, &B, &C, &D);

  if (D >= 10)
    return puts("Impossible"), 0;

  int combo = 0;
  int res = 0;
  for (int i = 0; i < B; ++i)
    res += 50 << (combo++ / 100);

  for (int i = 0; i < A; ++i)
    res += 100 << (combo++ / 100);

  puts("Possible");
  printf("%d\n", res);
}