# -*- coding:utf-8 -*-

if __name__ == "__main__":
	a,b,s = map(int,raw_input().split())
	if s == 1:
		print abs(a - 1) + 1
		exit()
	elif abs(b-s) >= abs(a-s):
		print abs(a-s) + s
	else:
		ans = abs(b-s) + s + abs(a-1)
		if a == 0:
			print ans
			exit()
		ans2 = abs(b-s) + abs(a-s) + a
		print min(ans,ans2)