#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0; i<(n); i++)

int main(){
	int a,b,c,d; cin>>a>>b>>c>>d;
	if(d==10){cout<<"Impossible"<<endl; return 0;}
	if(d<10) cout<<"Possible"<<endl;
	int ans=0;
	for(int i=0; i<b; i++){
		if(i<100) ans+=50;
		else if(i<200) ans+=100;
		else if(i<300) ans+=200;
		else if(i<400) ans+=400;
		else if(i<500) ans+=800;
		else if(i<600) ans+=1600;
	}
	int m=b%100+1;
	int r=b/100;
	if(r==0) r=1;
	else if(r==1) r=2;
	else if(r==2) r=4;
	else if(r==3) r=8;
	else if(r==4) r=16;
	else if(r==5) r=32;
	
	for(int i=m; i<a+m; i++){
		if(i<=100) ans+=100*r;
		else if(i<=200) ans+=100*r*2;
		else if(i<=300) ans+=100*r*4;
		else if(i<=400) ans+=100*r*8;
	}
	cout<<ans<<endl;
}