def solve(p):
    s = {(0, 0)}
    for _ in range(3):
        t = set()
        for x, y in s:
            t |= {
                (x - 2, y - 1),
                (x - 2, y + 1),
                (x - 1, y - 2),
                (x - 1, y + 2),
                (x + 1, y - 2),
                (x + 1, y + 2),
                (x + 2, y - 1),
                (x + 2, y + 1),
            }
        s = s.union(t)
    if p in s:
        return "YES"
    else:
        return "NO"


print(solve(tuple(map(int, input().split()))))