using System;
using System.Linq;

namespace Problem1101
{
    class Program
    {
        static void Main(string[] args)
        {
            var buff = GetIntArray();
            long V = buff[0];
            long T = buff[1];
            long P = buff[2];

            long t = (P + 1) * V;
            t += (t - 1) / (T - 1) + 1;

            Console.WriteLine(t);
        }
        public static int[] GetIntArray() => Console.ReadLine().Split().Select(int.Parse).ToArray();
    }
}