#include <bits/stdc++.h>
using ll = long long int;
using namespace std;
ll mod=1e9+7;
      
      
int main(){
  ll x,y,z;
  cin>> x >> y >> z;
  int a=0;
  if(z>=y){a++;}
  if(z>=x){a++;}
  cout << z-a << endl;
}