import sys
sys.setrecursionlimit(100000000)
MOD = 10 ** 9 + 7
INF = 10 ** 15

def main():
    N,M = map(int,input().split())
    if N >= 3:
        print('Possible')
    else:
        if M == 0:
            print('Impossible')
        else:
            print('Possible')
if __name__ == '__main__':
    main()