#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define all(x) (x).begin(),(x).end()
const int mod=1000000007,MAX=100003,INF=1<<30;

int main(){

    ll a,b,c;cin>>a>>b>>c;
    ll ans=c;
    if(a<=c) ans--;
    if(b<=c) ans--;
    
    cout<<ans<<endl;
}