#include "bits/stdc++.h"
using namespace std;

typedef long long ll;
typedef pair<int, int> pi;
typedef __int128 i128;
#ifdef DEBUG
#define dbg(x) cout << (#x) << " = " << (x) << "\n";
#else
#define dbg(x)
#endif

const int N = 2005;
const ll inf = 1e18;
int n, m, qq;
ll dp[N][N];
int a[N];
void solve() {
    cin >> n >> m;
    for (int i = 0; i <= n; i++) {
        for (int j = 0; j <= n; j++) {
            dp[i][j] = inf;
        }    
    }
    
    for (int i = 1; i <= n; i++) {
        cin >> a[i];    
    }
    
    sort(a + 1, a + 1 + n);
    reverse(a + 1, a + 1 + n);
    dp[0][0] = 0;
    ll out = inf;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            for (int k = 0; k < i; k++) {
                dp[i][j] = min(dp[i][j], dp[k][j - 1] + (ll)a[i] * (i - k));
            }
            
            if (j == m) out = min(out, dp[i][j]);
        }
    }
    
    cout << out << "\n";
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    solve();   
}