#include <bits/stdc++.h>
using namespace std;

int main()
{
	int A, B, C, D;
	cin >> A >> B >> C >> D;

	if( D >= 10 ) {
		cout << "Impossible" << endl;
	}
	else {
		int ans = 0;
		int combo = 0;
		while( B > 0 ) {
			int n = min( 100, B );
			ans += 50 * pow( 2, combo / 100 ) * n;
			combo += n;
			B -= n;
		}
		int rest = 100 - combo % 100;
		while( A > 0 ) {
			int n = min( rest, A );
			ans += 100 * pow( 2, combo / 100 ) * n;
			combo += n;
			A -= n;
			rest = 100;
		}
		cout << "Possible " << endl;
		cout << ans << endl;
	}
}