#include <iostream>
#include <algorithm>
#include <cmath>

using namespace std;

unsigned long long int A, B, C;

bool check(unsigned long long int mid)
{
    return C <= (unsigned long long int)(mid - (mid / A) + B * (mid / A));
}

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

    unsigned long long int lb = 0;
    unsigned long long int ub = C;
    unsigned long long int mid = 0;
   	while (ub - lb > 1) {
		mid = (ub + lb) / 2;
		if (check(mid)) {
			ub = mid;
		} else {
			lb = mid;
		}
	}

    cout << ub << endl;
    return 0;
}