A, B = map(int, input().split())
ans = 1e18
for a in range(201):
    for b in range(201):
        if (2*A - 1)*(a + b) <= 200*a < (2*A + 1)*(a + b) \
        and (2*B - 1)*(a + b) <= 200*b < (2*B + 1)*(a + b):
            ans = min(ans, a + b)
print(ans)