#include <bits/stdc++.h>
using namespace std;
#define int long long

signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);

    int n, m;
    cin >> n >> m;
    int arr[n + 2][m + 2];
    for (int i = 0; i < m + 2; i++)
    {
        arr[0][i] = 0;
        arr[n + 1][i] = 0;
    }
    for (int i = 0; i < n + 2; i++)
    {
        arr[i][0] = 0;
        arr[i][m + 1] = 0;
    }

    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++)
            cin >> arr[i][j];

    int ans = 0;
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= m; j++)
        {
            int curr1 = 0, curr2 = 0, curr3 = 0, curr4 = 0;
            for (int k = i + 1; k < n + 2; k++)
                curr1 = max(curr1, arr[k][j]);

            for (int k = 0; k < i; k++)
                curr2 = max(curr2, arr[k][j]);

            for (int k = 0; k < j; k++)
                curr3 = max(curr3, arr[i][k]);

            for (int k = j + 1; k < m + 2; k++)
                curr4 = max(curr4, arr[i][k]);

            int ans_curr = min(curr1, curr2);
            ans_curr = min(ans_curr, curr3);
            ans_curr = min(ans_curr, curr4);

            if (ans_curr > arr[i][j])
                ans += ans_curr - arr[i][j];
        }
    }
    cout << ans << '\n';
}