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

using namespace std;

long long int A, B, C;

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

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

    long long int lb = 0;
    long long int ub = C;
    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;
}