using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Bájital{
    class Program{
        static void Main(){
            string[] in1 = Console.ReadLine().Split();
            int N = int.Parse(in1[0]),
                X = int.Parse(in1[1]);

            int[] A = Console.ReadLine().Split().Select(int.Parse).ToArray();

            int max = 0, min = 0, maxi = 0, mini = 0, o1;


            for(o1 = 0; true; o1++){
                max = 0; min = int.MaxValue;
                for(int i=0; i<N; i++){
                    if(A[i] > max){
                        max = A[i];
                        maxi = i;
                    }else if(A[i] < min && A[i] != 0){
                        min = A[i];
                        mini = i;
                    }

                }
                if (max < X || min == max) break;

                A[maxi] -= X;
                A[mini] -= 1;
            }
            Console.WriteLine(o1);
        }
    }
}