#include <iostream>

using namespace std;
using LL = long long;
using ULL = unsigned long long;

ULL A, B, C;

ULL calc(ULL x) {
    ULL d = x / A;
    return d * B + x - d;
}

int main() {
    cin >> A >> B >> C;

    LL left = 0, right = C + 1;
    while (right - left > 1) {
        LL mid = (left + right) / 2;
        if (C <= calc(mid)) {
            right = mid;
        } else {
            left = mid;
        }
    }

    cout << right << endl;
}