A,B=map(int,input().split())
ans=1<<30
for a in range(1000):
    for b in range(1000):
        if (a,b)==(0,0):
            continue
        if (A,B)==((200*a+a+b)//(2*(a+b)),(200*b+a+b)//(2*(a+b))):
            ans=min(ans,a+b)
print(ans)