#include <bits/stdc++.h>
using ll = long long;
using llu = long long unsigned;

using namespace std;

int main() {
    ll X, Y, Z;
    cin >> X >> Y >> Z;

    ll result = Z;
    if (X<=Z) { result--; }
    if (Y<=Z) { result--; }
    cout << result << endl; return 0;
}