#include <iostream>

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

constexpr int INF = 1 << 30;
constexpr LL INFL = 1L << 62;
//constexpr int MOD = 998244353;

LL A, B, C;

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

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

    LL left = 0, right = 1L << 61;
    while (right - left > 1) {
        LL mid = (left + right) / 2;
        if (C <= calc(mid)) {
            right = mid;
        } else {
            left = mid;
        }
    }

    cout << right << endl;
}