#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int a,b,c,d;
  cin>>a>>b>>c>>d;
  if(d<10){
    int ans=0,p=1,cnt=0;
    rep(i,b){
      ans += 50 * p;
      cnt++;
      if (cnt % 100 == 0) p *= 2;
    }
    rep(i,a){
      ans += 100 * p;
      cnt++;
      if (cnt % 100 == 0) p *= 2;
    }
    cout<<"Possible"<<endl;
    cout<<ans<<endl;
  }else{
    cout<<"Impossible"<<endl;
  }
}