/* -*- coding: utf-8 -*-
 *
 * 745.cc:  No.745 letinopia raoha - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

/* subroutines */

inline int esum(int n) { return (1 << n) - 1; }

/* main */

int main() {
  int a, b, c, d;
  scanf("%d%d%d%d", &a, &b, &c, &d);

  if (d >= 10) {
    puts("Impossible");
    return 0;
  }

  int k = b / 100;
  b %= 100;
  int sum = esum(k) * 100 * 50;

  int ar = min(100 - b, a);
  sum += (1 << k) * (b * 50 + ar * 100);
  k++;
  a -= ar;

  int m = a / 100 + k;
  a %= 100;
  sum += (esum(m) - esum(k)) * 100 * 100;

  sum += (1 << m) * a * 100;
  m++;

  printf("Possible\n%d\n", sum);
  return 0;
}