A,B=map(int,input().split())
for i in range(1,100000):
    for j in range(i+1):
        if A*10-5<=1000*j//i and 1000*j//i<A*10+5:
            if B*10-5<=1000*(i-j)//i and 1000*(i-j)//i<B*10+5:
                print(i)
                exit()