namespace AtCoder;

#nullable enable

using System.Numerics;

static class Extensions
{
    public static T[] Repeat<T>(this int time, Func<T> F) => Enumerable.Range(0, time).Select(_ => F()).ToArray();

    public static int ToFlag(this int i)
    {
        if (i < 0 || 31 <= i) throw new IndexOutOfRangeException();
        return 1 << i;
    }
    public static bool OfFlag(this int value, int i) => (value & ToFlag(i)) > 0;
    public static int WithFlag(this int value, int i, bool f) => f ? (value | ToFlag(i)) : (value & ~ToFlag(i));

}

class AtCoder
{
    object? Solve()
    {
        var n = Int();
        var k = Int();
        var pz = new List<Complex>() { new(0, 0) };
        for (var i = 0; i < n; i++) pz.Add(new(Int(), Int()));
        var dz = new double[n + 1, n + 1];
        for (var i = 0; i <= n; i++) for (var j = 0; j <= n; j++) dz[i, j] = (pz[i] - pz[j]).Magnitude;
        var b = (n + 1).ToFlag();
        var dp = new double[b, n + 1, k + 1];
        for (var i = 0; i < b; i++) for (var j = 0; j <= n; j++) for (var l = 0; l <= k; l++) dp[i, j, l] = double.MaxValue;
        dp[1, 0, k] = 0;
        void F(int h, int c, int l)
        {
            var ct = dp[h, c, l];
            for (var next = 0; next <= n; next++)
            {
                var nt = ct + dz[c, next];
                if (next == 0)
                {
                    if (l == k || dp[h, 0, k] <= nt) continue;
                    dp[h, 0, k] = nt;
                    F(h, 0, k);
                    continue;
                }
                if (l == 0) break;
                var nh = h.WithFlag(next, true);
                if (dp[nh, next, l - 1] <= nt) continue;
                dp[nh, next, l - 1] = nt;
                F(nh, next, l - 1);
            }
        }
        F(1, 0, k);
        var ans = dp[b - 1, 0, k];
        return ans;
    }

    public static void Main() => new AtCoder().Run();
    public void Run()
    {
        var res = Solve();
        if (res != null)
        {
            if (res is bool yes) res = yes ? "Yes" : "No";
            sw.WriteLine(res);
        }
        sw.Flush();
    }

    string[] input = Array.Empty<string>();
    int iter = 0;
    readonly StreamWriter sw = new(Console.OpenStandardOutput()) { AutoFlush = false };

    string String()
    {
        while (iter >= input.Length) (input, iter) = (Console.ReadLine()!.Split(' '), 0);
        return input[iter++];
    }
    T Input<T>() where T : IParsable<T> => T.Parse(String(), null);
    int Int() => Input<int>();
    void Out(object? x, string? separator = null)
    {
        separator ??= Environment.NewLine;
        if (x is System.Collections.IEnumerable obj and not string)
        {
            var firstLine = true;
            foreach (var item in obj)
            {
                if (!firstLine) sw.Write(separator);
                firstLine = false;
                sw.Write(item);
            }
        }
        else sw.Write(x);
        sw.WriteLine();
    }
}