import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
sys.setrecursionlimit(10 ** 7)

a, b, c = map(int, readline().split())
if min(a, b, c) < b < max(a, b, c):
    print(0)
else:
    print(min(abs(c - b), abs(b - a)))