from itertools import pairwise
from math import inf


def main():
    N, K = map(int, input().split())
    a = sorted(map(int, input().split()))

    a_diff = [0]
    for a_elm1, a_elm2 in pairwise(a):
        a_diff.append(a_elm2 - a_elm1)
    dp_table = [[0 for _ in range(K+1)] for _ in range(N+1)]

    dp_table[0][0] = 0
    for idx in range(1, N+1):
        dp_table[idx][0] = inf

    for idx in range(1, K+1):
        dp_table[0][idx] = inf

    for k in range(1, K+1):
        for n in range(1, N+1):
            dp_table[n][k] = min(
                dp_table[n-1][k-1],
                dp_table[n-1][k]+a_diff[n-1]
            )
    print(dp_table[N][K])


if __name__ == "__main__":
    main()