#include <iostream>
#include <bits/stdc++.h>
using namespace std;
int main(void){
    // Your code here!
    int a,b,c,d;
    cin>>a>>b>>c>>d;
    if(d>=10){cout<<"Impossible"<<endl;return 0;}
    else cout<<"Possible"<<endl;
    int cnt=0;
    int ans=0;
    for(int i=0;i<b;i++){
        ans+=50*pow(2,cnt/100);
        cnt++;
    }
    for(int i=0;i<a;i++){
        ans+=100*pow(2,cnt/100);
        cnt++;
    }
    cout<<ans<<endl;
}