#include<stdio.h>
int main()
{
	int a, b, c, d;
	scanf("%d %d %d %d", &a, &b, &c, &d);
	if (d == 10)
	{
		printf("Impossible\n");
		return 0;
	}
	printf("Possible\n");
	int p1, p2;
	p1 = 100;
	p2 = 50;
	c = 0;
	int ans = 0;
	while (b > 0)
	{
		ans += p2;
		b--;
		c++;
		if (c == 100)
		{
			c = 0;
			p1 *= 2;
			p2 *= 2;
		}
	}
	while (a > 0)
	{
		ans += p1;
		a--;
		c++;
		if (c == 100)
		{
			c = 0;
			p1 *= 2;
		}
	}
	printf("%d\n", ans);
	return 0;
}