/*
 * File:   main.cpp
 * Author: akash
 *
 * Created on 2 July, 2012, 3:17 PM
 */
#include <stdio.h>
#include <vector>
using namespace std;
int main(){
    int i,j,n,k,temp,maxFrequency,frequency,min,remaining,index,ans = 0;
    int number_to_made_one;
    vector<int> numbers;
    vector<int> flags(100000,0);
    scanf("%d%d",&n,&k);
    remaining = n;
    for(i=0;i<n;i++){
        scanf("%d",&temp);
        numbers.push_back(temp);
    }
    while(remaining != 0){
    maxFrequency = 0;
    for(i=0;i<=n-k;i++){
        min = 1000000002;
        for(j=i;j<i+k;j++){
            if(flags[j] == 0){
                if(numbers[j] < min)
                    min = numbers[j];
            }
        }
        frequency = 0;
        for(j=i;j<i+k;j++){
            if(numbers[j] == min && flags[j] == 0)
                frequency++;
        }
        if(frequency > maxFrequency){
            maxFrequency = frequency;
            index = i;
            number_to_made_one = min;
        }
    }
    for(i=index;i<index+k;i++){
        if(numbers[i] == number_to_made_one && flags[i] == 0){
            flags[i] = 1;
            remaining--;

                }
    }
        ans++;
}
    printf("%d\n",ans );
    return 0;
}