#include <bits/stdc++.h>
#define For(i, a, b) for(int i = a; i < b; i++)
#define rep(i, n) For(i, 0, n)
#define rFor(i, a, b) for(int i = a; i >= b; i--)
#define ALL(v) (v).begin(), (v).end()
#define rALL(v) (v).rbegin(), (v).rend()
using namespace std;

using lint = long long;
using ld = long double;

int INF = 2000000000;
lint LINF = 1000000000000000000;

int main() {
    int a, b, s;
    cin >> a >> b >> s;
    if (s == 1) {
        cout << abs(a - 1) + 1 << endl;
    } else if (abs(s - a) <= abs(s - b)) {
        cout << abs(a - s) + s << endl;
    } else {
        // B:b->s, B:s->1, A:a->1, A:1->0
        int ans1 = abs(b - s) + s - 1 + abs(a - 1) + 1;
        // B:b->s, B:s->a, A:a->0
        int ans2 = abs(b - s) + abs(s - a) + a;
        cout << (a != 0 ? min(ans1, ans2) : ans1) << endl;
    }
}