import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

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

def to_precent(num,den):
    num *= 100
    num = num + num + den
    den += den
    return num // den

answer = 1000
for a in range(301):
    for b in range(301):
        if a+b == 0:
            continue
        if a+b >= answer:
            break
        if A == to_precent(a,a+b) and B == to_precent(b,a+b):
            answer = a + b

print(answer)