#!/usr/bin/python
# -*- coding: utf-8 -*-
# †
from __future__ import unicode_literals
import sys, codecs
sys.stdout = codecs.getwriter('utf-8')(sys.stdout)

A, B, S = map(int, raw_input().split())
# Aがくる
if S == 1 or abs(A - S) <= abs(B - S):
    res = abs(A - S) + S
# Bがくる
else:
    # Bで1階に行ってAをよぶ
    cand1 = abs(B - S) + (S - 1) + abs(A - 1) + 1
    # BでAのいるところまで行く
    cand2 = abs(B - S) + abs(A - S) + A if A > 0 else float('inf')
    res = min(cand1, cand2)
print res