A,B,C = map(int,input().split())

number = [A,B,C]

cnt = cnt2 = 0

cnt = abs(A-C)

b = B
number = sorted(number)

if number[1] != b:
    cnt2 = min(abs(number[0]-number[1]),abs(number[1]-number[2]))

print(min(cnt,cnt2))