#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);++i)
#define all(a) (a).begin(),(a).end()
using namespace std;
typedef long long ll;

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;
  }
  vector<int> combo;
  rep(i,b) combo.push_back(50);
  rep(i,a) combo.push_back(100);
  int m = 1;
  int ans = combo[0];
  for(int i = 1;i <= a + b - 1;++i){
  	if(int(i/100) > int((i - 1)/100)){
  		m *= 2;
  	}
  	ans += combo[i] * m;
  }
  cout << "Possible" << endl;
  cout << ans << endl;
  return 0;
}