import sys
input = lambda :sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
ms = lambda: map(str, input().split())
mf = lambda: map(float, input().split())
li = lambda: list(mi())
sys.set_int_max_str_digits(0)


A, B = mi()
print("Possible" if A%2==B%2 else "Impossible")