a, b = map(int, input().split())
for s in range(1, 201):
    for i in range(s + 1):
        j = s - i
        x = (200 * i + s) // (2 * s)
        y = (200 * j + s) // (2 * s)
        if (x, y) == (a, b):
            print(s)
            exit()