include <stdio.h>

int pcl[105][105];

int main() {

int n, m, i, j, a = 0;
scanf("%d %d", &n, &m);
for (int i = 1; i <= n; i++) {
	for (int j = 1; j <= m; j++) {
		scanf("%d", &pcl[i][j]);
	}
}
for (int i = 1; i <= n; i++) {
	for (int j = 1; j <= m; j++) {
		if (i == 1 || i == n || j == 1 || j == m) {
			a += pcl[i][j];
		}
	}
}
printf("%d", a);

}