ans = 200

A, B = map(int, input().split())
A *= 10
B *= 10
if A < B:
    A, B = B, A
    
ans = 200
    
for i in range(1, 201):
    
    for j in range(i + 1):
        
        a = (1000 * i) // (i + j)
        b = (1000 * j) // (i + j)
        
        if A - 5 <= a < A + 5 and B - 5 <= b < B + 5:
            
            ans = min(ans, i + j)
            
print(ans)