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():
	N, M = getlist()
	if (N == 2 and M == 0) or (N == 1 and M == 0):
		print("Impossible")
	else:
		print("Possible")
	




if __name__ == '__main__':
	main()