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#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;
}