Snuke is giving cookies to his three goats.  He has two cookie tins. One contains A cookies, and the other contains B cookies. He can thus give A cookies, B cookies or A+B cookies to his goats (he cannot open the tins).  Your task is to determine whether Snuke can give cookies to his three goats so that each of them can have the same number of cookies.
A, B = map(int,input().split())

if A % 3 == 0 or B % 3 ==0 or (A + B) % 3 ==0:
    print("possible")
else:
    print("impossible")
A, B = map(int,input().split())

if A % 3 == 0 or B % 3 ==0 or (A + B) % 3 ==0:
    print("Possible")
else:
    print("Impossible")