#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define int long long
using namespace std;
typedef pair<int, int> P;
const int mod = 1000000007;
const int INF = 1e18;

signed main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int l, r, m;
    cin >> l >> r >> m;
    if(r - l + 1 >= m){
        cout << m << endl;
    }else{
        cout << r - l + 1 << endl;
    }
}