using System;
using System.Linq;
using System.Collections.Generic;
public class Hello{
    public static void Main()
    {
        var str = String.Empty;
        string N = "6534584351565431546351314865641313541354";
        int n = 5;
        foreach (var item in Function(N, n))
        {
            str+=item;
        }
        Console.WriteLine(N + " \n* " + n);
        Console.WriteLine(str);
    }
    public static List<int> Function(string N, int n)
    {
        var num = N.ToCharArray().ToList()
                   .Select(s => Convert
                   .ToInt32(s.ToString()))
                   .ToList();
        num.Reverse();

        // initially remainder is 0
        var remainder = 0;
        for (int i = 0; i < num.Count; i++)
        {
            var temp = num[i] * n + remainder;
            var inString = temp.ToString();

            if (inString.Length > 1)
            {
                num[i] = Convert.ToInt32(inString[1].ToString());
                remainder = Convert.ToInt32(inString[0].ToString());
            }
            else
            {
                num[i]= Convert.ToInt32(inString[0].ToString());
                remainder = 0;
            }
        }
        if(remainder!=0)
        {
            num.Add(remainder);
        }
        num.Reverse();
        return num;
    }
}