#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;

  int ans = 0;
  if (S == 1) {
    ans += abs(A - S);
    A = S;
    return cout << ans + A << "\n", 0;
  }

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