goal = map(int, raw_input().split())
goal = tuple(goal)
moves = [(-2, -1), (-2, 1), (-1, -2), (-1, 2),
         (1, -2), (1, 2), (2, -1), (2, 1) ]

def dfs_maybe((x, y), n):
    if (x, y) == goal:
        return True
    elif n == 3:
        return False

    for i in xrange(8):
        if dfs_maybe((x + moves[i][0], y + moves[i][1]), n+1):
            return True
    return False

print 'YES' if dfs_maybe((0, 0), 0) else 'NO'