#include<iostream>
#include<string>
using namespace std;
int main(){
    int a,b,c,d,e,n,a1,b1,a2,b2,a3,f=1,ans=0;
    cin>>a>>b>>c>>d;
    if(d==10)cout<<"Impossible"<<endl;
    else {
        n=a+b;
        e=a/100;
        b1=b/100;
        b2=b%100;
        for (int i=1; i<=b1; i++) {
            ans+=5000*f;
            f*=2;
        }
        ans+=f*50*b2;
        a3=100-b2;
        ans+=f*100*a3;
        f*=2;
        a-=a3;
        a1=a/100;
        a2=a%100;
        for (int i=1; i<=a1; i++) {
            ans+=10000*f;
            f*=2;
        }
        ans+=a2*f*100;
        cout<<"Possible"<<endl;
        cout<<ans<<endl;
    }
}