using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static long[] NList => ReadLine().Split().Select(long.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (v, t, p) = (c[0], c[1], c[2]);
        v *= p + 1;
        var x = v / (t - 1);
        if (v % (t - 1) == 0) --x;
        WriteLine(v + x + 1);
    }
}