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

using lint = long long int;
using pint = pair<int, int>;
using plint = pair<lint, lint>;

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

    lint ans;

    ans = -(z >= x) - (z >= y) +z;

    cout
        << ans << "\n";

    return 0;
}