// yukicoder: 745 letinopia raoha
// 2019.5.19 bal4u

#include <stdio.h>

int main()
{
	int A, B, C, D, k, ans;
	
	scanf("%d%d%d%d", &A, &B, &C, &D);
	if (D >= 10) { puts("Impossible"); return 0; }
	k = 1, ans = 0;
	while (B > 100) {
		ans += k*50*100;
		B -= 100, k <<= 1;
	}
	if (B > 0) {
		ans += k*50*B;
		if (A+B > 100) {
			ans += k*100*(100-B);
			A -= 100-B, k <<= 1;
		}
	}
	while (A > 100) {
		ans += k*100*100;
		A -= 100, k <<= 1;
	}
	ans += k*100*A;
	printf("Possible\n%d\n", ans);
	return 0;
}