import itertools
import numpy as np

N, M = map(int, input().split())
A = np.array([list(map(int, input().split())) for _ in range(N)])


def make_table(t, slash, backslash):
    fancy = np.nonzero(t)
    table = A.copy()
    solved = 0

    solved += np.sum(table[fancy, :])
    table[fancy, :] = 0

    if slash:
        for i in range(N):
            solved += table[i, i]
            table[i, i] = 0
    if backslash:
        for i in range(N):
            solved += table[N - i - 1, i]
            table[N - i - 1, i] = 0

    return table, solved


ans = 100 * N * N

# 横と斜めは全列挙
for t in itertools.product((0, 1), repeat=N):
    row = t.count(1)
    if not M - N - 2 <= row <= M:
        continue
    for slash, backslash in ((0, 0), (1, 0), (0, 1), (1, 1)):
        col = M - row - slash - backslash  # 削るべき列数
        if not 0 <= col <= N:
            continue
        table, solved = make_table(t, slash, backslash)

        # 縦のうれしい順に選ぶ
        additional_solved = np.sum(table, axis=0)
        additional_solved.sort()
        solved += sum(additional_solved[:col])
        ans = min(ans, solved)
print(ans)