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

const long long INF = LLONG_MAX / 2;

int main() {
    int n, k;
    cin >> n >> k;
    long long A[n];
    for(int i = 0; i < n; i++) cin >> A[i];

    sort(A, A + n);

    // DP[i][j] represents the minimum sum of sizes of sets obtained by dividing the first i elements into j subsets.
    long long DP[n + 1][k + 1];
    for(int i = 0; i <= n; i++) {
        for(int j = 0; j <= k; j++) {
            DP[i][j] = INF;
        }
    }

    // Base case: If we have 0 elements, the minimum sum is 0 for any number of subsets.
    for(int j = 0; j <= k; j++) {
        DP[0][j] = 0;
    }

    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= k; j++) {
            for(int p = 0; p < i; p++) {
                // Calculate the size of the current subset.
                long long size = A[i - 1] - A[p];
                // Update the DP table.
                DP[i][j] = min(DP[i][j], DP[p][j - 1] + size);
            }
        }
    }

    // The answer will be stored in DP[n][k].
    cout << DP[n][k] << endl;

    return 0;
}