#include <bits/stdc++.h>
#define rep(i,n) for (int i=0; i<(n); ++i)
using namespace std;
using ll=long long;
int main(){
    ll x,y,z;
    cin>>x>>y>>z;
    ll ans=z;
    if(x<=z)ans--;
    if(y<=z)ans--;
    cout<<ans<<endl;
}