h1 = int(input())
h2 = int(input())
h3 = int(input())

my_max = max(h1, h2, h3)
my_min = min(h1, h2, h3)
my_mid = h1 + h2 + h3 - my_max - my_min

diff = min(my_max - my_min, my_max - my_mid, my_mid - my_min)


if my_max - diff == my_mid:
    if my_mid - diff == my_min:
        odsutna = my_max - 3 * diff
    else:
        odsutna = my_max - 2 * diff
else:
    odsutna = my_max - diff

print(odsutna)