#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;
}

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1 2 3 4
5 6 7 8
9 0 1 2