#include <bits/stdc++.h>

using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()

template<typename A, typename B> inline bool chmax(A &a, B b) { if (a<b) { a=b; return 1; } return 0; }
template<typename A, typename B> inline bool chmin(A &a, B b) { if (a>b) { a=b; return 1; } return 0; }

typedef unsigned long long ull;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, pii> P;

const ll INF = 1ll<<29;
const ll MOD = 1000000007;
const double EPS  = 1e-10;

int main() {
	ll x, y, d;
	cin >> x >> y >> d;
	
	ll sy = 0, ey = 1;
	
	if (d <= y) sy = d;
	if (d - y > 0 && d - y <= x) sy = y;
	
	if (d <= x) ey = 0;
	if (d - x > 0 && d - x <= y) ey = d - x;
	
	cout << sy - ey + 1 << endl;
	
	return 0;
}