#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
#define ITER(c)             __typeof__((c).begin())
#define FOREACH(it, c)      for (ITER(c) it=(c).begin(); it != (c).end(); ++it)
#define REP(i, n)           for(int(i)=0;(i)<(n);++(i))
#define RREP(i, n)          for(int(i)=(n)-1;(i)>=0;--(i))
const int MOD = (int)1e9+7;

int N,M,W,H;

int main(){
    int A,B,S;
    cin >> A >> B >> S;
    if(abs(A-S) <= abs(B-S)){
        cout << abs(A-S) + S << endl;
    } else {
        int minv = abs(B-S) + S - 1 + abs(A-1) + 1;
        if(A != 0){
        minv = min(minv, abs(B-S) + abs(A-S) + A);
        }
        cout << minv << endl;
    }

}