#include using namespace std;

int n,m;

int a[105][105];

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

int ans=0;
for (int i=1;i<=n;i++)
for (int j=1;j<=m;j++)
	if (i==1||i==n||j==1||j==m)
		ans += a[i][j];
cout << ans << endl;

}