#include <bits/stdc++.h>
using namespace std;

int main() {
    long x, y, z;
    cin >> x >> y >> z;
    if(x <= z && y <= z) {
        if(z - 2 > 0) {
            cout << z - 2 << endl;
        }else {
            cout << 0 << endl;
        }
    }else if((x <= z && y > z) || (x > z && y <= z)) {
        cout << z - 1 << endl;
    }else {
        cout << z << endl;
    }
}