#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;


int main(){
  int A, B, C, D;
  cin >> A >> B >> C >> D;

  if(D == 10){
    cout << "Impossible" << endl;
  }else{
    int a = 100;
    int b = 50;
    int combo = 0;
    int ret = 0;
    while(A+B > 0){
      combo++;
      if(combo != 1 && combo%100 == 1){
        a*=2;
        b*=2;
      }
      if(B>0){
        B--;
        ret += b;
      }
      else{
        A--;
        ret += a;
      }
    }
    cout << "Possible" << endl;
    cout << ret << endl;
  }
  
  return 0;
}