using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        long result = repeatedString("aba", 7);

        Console.WriteLine(result);

        string s = String.Concat(Enumerable.Repeat("aba", 5));

        Console.WriteLine(s);

​

    }

    static long repeatedString(string s, long n) {

        long count = 0;

        var repeat = (int)n/s.Length;

        var remain = (int)n%s.Length;

        s = String.Concat(Enumerable.Repeat(s, repeat)); 

        s = String.Concat(s, s.Substring(0, remain));

        Console.WriteLine(s);

        count = s.ToList().Where(c=>c == 'a').LongCount();

​

        return count;

    }

​

}