#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
typedef long long ll;
const int MOD = (int)(1e9+7);
const int INF = (int)(1e9+1e7);
const ll INFL = (ll)(1e17);
const double EPS = 1e-8;
using namespace std;
int main()
{
    ll x,y,z;
    cin >> x >> y >> z;
    ll ans = z;
    if(x<=z){ans--;}
    if(y!=x&&y<=z){ans--;}
    cout << ans << endl;
}