using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Code
{
    class Program
    {
        static void Main(string[] args)
        {
            string line = Console.ReadLine();
            string[] values = line.Split(' ');
            long A = long.Parse(values[0]); 
            long B = long.Parse(values[1]); 
            long C = long.Parse(values[2]); 

            long year = 1;
            long sum = 0;
            while (true)
            {
                if (year % A == 0) sum += B;
                else sum += 1;
                if (sum >= C) break;
                year++;
            }
            Console.WriteLine(year);
        }
    }
}