#include<stdio.h>
int main()
{
    int m,n,sum=0;
    scanf("%d %d",&m,&n);
    int arr[m][n];
    for(int i=0;i<m;i++)
    {
        for(int j=0;j<n;j++)
        {
            scanf("%d",&arr[i][j]);
            if(i==0||i==m-1||j==0||j==n-1)
            {
                sum+=arr[i][j];
            }
        }
    }
    printf("%d",sum);
    return 0;
}
```


```

m, n = map(int, input().split())
a = []
sum = 0
for i in range(m):
    row = list(map(int, input().split()))
    a.append(row)
for i in range(m):
    for k in range(n):
        if i == 0 or i == m - 1 or k == 0 or k == n - 1:
            sum += a[i][k]
print(sum)

#include <stdio.h>

int main()
{
    int j, k, count = 0;
    scanf("%d%d\n", &j, &k);
    int a[j][k];
    for (int i = 0; i < j; i++)
    {
        for (int p = 0; p < k; p++)
        {
            scanf("%d", &a[i][p]);
            if (i == 0 || i == j - 1 || p == 0 || p == k - 1)
            {
                count += a[i][p];
            }
            
        }
    }
    printf("%d", count);

    return 0;
}

#include <stdio.h>
int main()
{
	int n,m=0;
	scanf("%d %d",&n,&m);
    int a[n][m];
    int i=0;
    int sum=0;
    int num=0;

    for (i=0;i<n;i++){
        for (num=0;num<m;num++){
            scanf("%d",&a[i][num]);
            if (i==0||i==n-1||num==0||num==m-1)
                sum+=a[i][num];
        }
    }
    printf("%d",sum);
    return 0;
}