#include<bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
#define V vector
#define VI vector<int>
#define VVI vector<vector<int>>

using namespace std;

int main(void){
    long long X,Y,Z;
    cin>>X>>Y>>Z;
    if(X<=Z)Z--;
    if(Y<=Z)Z--;
    cout<<Z<<endl;
    return 0;
}