from sys import stdin
import math
import re
import queue
import numpy as np
from numpy.linalg import matrix_rank

input = stdin.readline

# MOD = 1000000007
MOD = 998244353
INF = 122337203685477580


def solve():	
    n,m = map(int, input().split()) 
    if m == 0 and n <= 2:
        print("Impossible")
    else:
        print("Possible")

    return

if __name__ == '__main__':
    solve()