def round(x, d=0):
    p = 10**d
    return (x*p*10+5)//10/p

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

ans = 500
for a in range(201):
    for b in range(201):
        if a==0 and b==0:
            continue
        else:
            alpha = round(100*a/(a+b))
            beta = round(100*b/(a+b))
            if alpha == A and beta == B:
                ans = min(ans, a+b)

print(ans)