import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

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

if A < B > C:
    A,B,C = -A,-B,-C

if A > C:
    A,C = C,A

# 2,1,3 の順になっている
x = A - B
y = C - A
answer = min(x,y)
print(answer)