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

for s in range(1, 1000000):
    for a in range(0, s + 1):
        b = s - a
        # s * (A - 0.5) / 100 <= a < s * (A + 0.5) / 100
        if s * (10 * A - 5) <= a * 1000 < s * (10 * A + 5) and \
           s * (10 * B - 5) <= b * 1000 < s * (10 * B + 5):
            print(s)
            sys.exit()