inf = 10**18

a,b = map(int, input().split())
if a>b:
    a,b = b,a
if a*b==0:
    print(b); exit()

ans = inf
for i in range(a+1):
    for j in range(a+1):
        ans = min(ans, abs((i+j) - ((b-i)+(a-j))))
print(ans)