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

using namespace std;

long long int A, B, C, money = 0, age = 0;

int main()
{
    cin >> A >> B >> C;
    while(true)
    {
        age++;

        if(age % A == 0)
        {
            money += B;
        }
        else 
        {
            money += 1;
        }

        if(money >= C)
            break;
    }

    cout << age << endl;

    return 0;
}