#include <bits/stdc++.h>

using namespace std;

//难
int main() {
    int m, n, k, count = 0;
    cin >> m >> n >> k;

    int p = 0, q = 0;
    for (int i = 1; i <= k; i++) {
        if (p < m)p++;
        else p = 1;

        if (q < n)q++;
        else q = 1;

        if (p == q) count++;
    }
    cout << count << endl;
    return 0;
}