a,b = map(int,input().split())
if a >= 0 and b >= 0:
    ans = a+b
elif a >= 0 and b < 0:
    ans = abs(a-abs(b))
elif a < 0 and b >= 0:
    ans = abs(b-abs(a))
else:
    ans = abs(a+b)
print(ans)