A, B = map(int, input().split())

for s in range(1, 201):
    for a in range(s + 1):
        b = s - a
        x = (200*a + s) // (2*s)
        y = (200*b + s) // (2*s)
        if (x, y) == (A, B):
            print(s)
            exit()