#include <bits/stdc++.h>
#define Int int64_t

using namespace std;

int main() {
	Int x, y, z;
	cin >> x >> y >> z;

	if (y <= z) { cout << z - 2 << endl; }
	else if (x <= z) { cout << z - 1 << endl; }
	else { cout << z << endl; }

	return 0;
}