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#include <bits/stdc++.h>
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#define ll long long
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using namespace std;
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ll w, h, n;
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bool check(ll len) {
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    ll row = (len / w);
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    ll col = (len / h);
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    return (row * col >= n);
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}
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int main() {
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    std::ios_base::sync_with_stdio(false);
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    cin.tie(0);
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    cout.tie(0);
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    cin >> w >> h >> n;
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    ll low = 0, high = min(max(h, w * n), max(w, h * n)), ans = high;
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    while (low <= high) {
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        ll mid = (low + high) / 2;
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        if (check(mid)) {
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            ans = mid;
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            high = mid - 1; 
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        } else {
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            low = mid + 1;
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        }
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    }
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    cout << ans;
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    return 0;
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}