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

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl
#define p_yes() p("Yes")
#define p_no() p("No")

const ll mod = 1e9 + 7;
const ll inf = 1e18;

template < typename T >
void vprint(T &V){
	for(auto v : V){
    	cout << v << " ";
	}
	cout << endl;
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    ll A, B, S;
    cin >> A >> B >> S;

    // Aが来る
    if(abs(A-S) <= abs(B-S)){
        ll come = abs(A-S);
        ll go = S;
        p(come + go);
        return 0;
    }

    // Bが来る
    ll come = abs(B-S);
    
    // BでAまで移動するパス
    ll path0 = come + abs(A-S) + A;
    if(A==0){
        path0 = inf;
    }

    // 1Fまで移動してAを呼ぶパス
    ll path1 = come + S-1 + abs(A-1) + 1;

    p(min(path0, path1));
    
    return 0;
}