#include <iostream>
#include <math.h>
using namespace std;
int main(int argc, char* argv[])
{
	int A,B,C,D;
	int count=0;
	int aV=100;
	int bV=50;
	int dV=-100;
	cin>>A>>B>>C>>D;
	if (D*100>=1000){
		cout<<"Impossible"<<endl;
		return 0;
	}
	int Sum=0;
	int n2;
	int i;
	for (i=1;i<=B;i++){
		n2=pow(2.0,(double)(count/100));
		Sum+=bV*n2;
		count++;
	}
	for (i=1;i<=A;i++){
		n2=pow(2.0,(double)(count/100));
		Sum+=aV*n2;
		count++;
	}
	cout<<"Possible"<<endl;
	cout<<Sum<<endl;
	return 0;
}