using System;

using System.Diagnostics;

public class Program

{

    public static void Main()

    {

        const int N = 1_000_000;

        var s1 = "qwerty";

        var s2 = "asdf";

        var sw = Stopwatch.StartNew();

        for (int i = 0; i < N; i++) 

        {

            var _ = s1 + s2;

        }

        sw.Stop();

        Console.WriteLine($"Concatenation {N} times: {sw.ElapsedMilliseconds}ms");

        sw.Restart();

        for (int i = 0; i < N; i++)

        {

            var _ = $"{s1}{s2}";

        }

        sw.Stop();

        Console.WriteLine($"Interpolation {N} times: {sw.ElapsedMilliseconds}ms");

    }

}