#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

int N, K;
vector<long> nums;
long dp[5000][5000];

long choose(int now, int array_now){
    if(now == N){
        return 0;
    }else if(dp[now][array_now] != -1){
        return dp[now][array_now];
    }else if(array_now == K){
        return dp[now][array_now] = choose(now + 1, array_now) + nums[now] - nums[now - 1];
    }else{
        return dp[now][array_now] = min(choose(now + 1, array_now) + nums[now] - nums[now - 1], choose(now + 1, array_now + 1));
    }
}

int main(){
    cin >> N >> K;
    nums.resize(N);
    for(int i = 0; i < N; i++){
        cin >> nums[i];
    }
    sort(nums.begin(), nums.end());
    for(int i = 0; i < 5000; i++){
        for(int j = 0; j < 5000; j++){
            dp[i][j] = -1;
        }
    }
    cout << choose(1, 1) << endl;
}