#include <bits/stdc++.h>
#define rep(i,n) for (int i =0;i < (n); ++i)
using namespace std;
typedef long long ll;

int main() {
    ll a,b,c;
    cin>>a>>b>>c;
    ll ans=c;
    if ( a<=c ) {
        ans--;
    }
    if ( b<=c ) {
        ans--;
    }
    cout<<ans<<endl;
    return 0;
}