import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	A, B, C, D = getlist()
	if D >= 10:
		print("Impossible")
		return

	ans = 0
	L = [0] + [50] * B + [100] * A
	for i in range(1, len(L)):
		ans += L[i] * pow(2, int((i - 1) // 100))

	print("Possible")
	print(ans)

if __name__ == '__main__':
	main()