#include "bits/stdc++.h"

using namespace std;
typedef long long ll;
#define rep(i, j, n) for (int i = j; i < n; i++)
#define out(ans) cout << ans << endl;
const long long mod = 1e9 + 7;

int main() {

  ll x,y,z;cin>>x>>y>>z;

  int count=0;
  if(x<=z)count++;
  if(y<=z)count++;

  out(z-count);


  return 0;
}