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]);

            //M年ごとにA+B-1円
            long turn = C / (A + B - 1);
            long ans;

            if ((turn + 1) * (A + B - 1) - B < C) ans = (turn + 1) * A; //Aの倍数時に突破するとき
            else ans = turn * (1 - B) + C;

            Console.WriteLine(ans);
        }
    }
}