#include <bits/stdc++.h>
using namespace std;

int main()
{
    // 入力
    int64_t A, B, C;
    cin >> A >> B >> C;

    // 二分探索
    int64_t left = 0;
    int64_t right = C;
    int64_t ans = 0;
    while(right - left > 1)
    {
        int64_t mid = (left+right)/2;
        int64_t sum = (mid/A)*B + mid-(mid/A);
        ans = right;
        if(sum >= C) right = mid;
        else left = mid;
    }

    // 解を出力
    cout << ans << endl;
    return 0;
}