A, B = map(int, input().split())
m = 10**18
ans = -1
for a in range(0, 201):
    for b in range(0, 201):
        if a+b == 0:
            continue
        X = (100*a+(a+b)//2)//(a+b)
        Y = (100*b+(a+b)//2)//(a+b)
        if X == A and Y == B:
            if a+b < m:
                ans = [a, b]
                m = a+b
print(m)