#include <bits/stdc++.h>

using namespace std;

int main() {
    long long a, b, c, ans;
    cin >> a >> b >> c;

    if (b <= c) {
        ans = c - 2;
    } else if (a <= c) {
        ans = c - 1;
    } else {
        ans = c;
    }
    
    cout << setprecision(20) << ans << endl;
    
    return 0;
}