#include <bits/stdc++.h>
using namespace std;

template <typename T, typename U> bool cmin(T &a, U b) { return a > b && (a = b, true); }
template <typename T, typename U> bool cmax(T &a, U b) { return a < b && (a = b, true); }

signed main() {
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);

  int A, B, S;
  cin >> A >> B >> S;

  if (S == 1 || abs(S - A) <= abs(S - B)) return cout << abs(S - A) + S << "\n", 0;

  int ans1 = abs(S - B) + abs(S - A) + A;
  int ans2 = abs(S - B) + abs(S - 1) + A;
  cout << min(ans1, ans2) << "\n";
}