# coding: utf-8 import collections, copy, heapq, itertools, math, sys sys.setrecursionlimit(10 ** 7) INF = 10 ** 20 MOD = 10 ** 9 + 7 def II(): return int(input()) def ILI(): return list(map(int, input().split())) def IAI(LINE): return [ILI() for __ in range(LINE)] def IDI(): return {key: value for key, value in ILI()} def read(): N, M = ILI() return (N, M) def solve(N, M): if M == 0 and N <= 2: ans = "Impossible" else: ans = "Possible" return ans def main(): params = read() print(solve(*params)) if __name__ == "__main__": main()