#include <stdio.h>

int main() {
    int M, N;
    int matriks[100][100];
    int jumlah = 0;

    scanf("%d %d", &M, &N);

    for (int i = 0; i < M; i++) {
        for (int j = 0; j < N; j++) {
            scanf("%d", &matriks[i][j]);
        }
    }


    for (int i = 0; i < M; i++) {
        for (int j = 0; j < N; j++) {


            if (i == 0 || i == M - 1 || j == 0 || j == N - 1) {
                jumlah += matriks[i][j];
            }

        }
    }

    printf("%d\n", jumlah);

    return 0;
}