#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}

//INSERT ABOVE HERE
signed main(){
  Int a,b,c,d;
  cin>>a>>b>>c>>d;
  if(d==10){
    cout<<"Impossible"<<endl;
    return 0;
  }
  cout<<"Possible"<<endl;
  vector<Int> v;
  for(Int i=0;i<a;i++) v.emplace_back(100);
  for(Int i=0;i<b;i++) v.emplace_back(50);
  sort(v.begin(),v.end());
  Int ans=0;
  for(Int i=0;i<a+b;i++) ans+=v[i]<<(i/100);
  cout<<ans<<endl;
  return 0;
}