#include<iostream>
#include<algorithm>
#include<cmath>
using namespace std;
using lint=int64_t;

int main()
{
	int A,B,C,D;
	
	cin >> A >> B >> C >> D;
	
	if(D>=10)
	{
		cout << "Impossible" << endl;
		return 0;
	}

	cout << "Possible" << endl;
	int com=0;
	int ans=0;
	for(int i=0;i<B;i++)
	{
		com++;
		ans+=(50*pow(2,(com-1)/100));
	}
	for(int i=0;i<A;i++)
	{
		com++;
		ans+=(100*pow(2,(com-1)/100));
	}

	cout << ans << endl;

	return 0;
}