#N, M = list(map(int, input().split()))
N, M = [1, 0]
lim0 = 0.000001
nums0 = tuple([i + 1 for i in range(N)])
#print("nums0", nums0)
stack = {nums0: {M}}

if nums0 == (1) & M ==0:
    print("Impossible")
    exit()

while stack != {}:
    nums, Ms = stack.popitem()
    #print(nums, set(nums))
    nums = set(nums)
    if nums == set():
        for j in Ms:
            if abs(j) < lim0:
                print("Possible")
                exit()
    else:
        for ni in nums:
            for mi in Ms:
                temp = {mi + ni, mi * ni, mi - ni, ni - mi, mi/ ni}
                if mi != 0:
                    temp.add(ni / mi)
                try:
                    #print("curent",stack[tuple(nums - {ni})], "addition", temp )
                    stack[tuple(nums - {ni})] = stack[tuple(nums - {ni})] | temp
                except KeyError:
                    stack[tuple(nums - {ni})] = temp

                #print("stack: ", stack)

print("Impossible")