#include<iostream>
using namespace std;
int main(){
    int a[105][105],b,c,sum;
    cin>>b>>c;
    for(int i=1;i<=b;i++){
        for(int j=1;j<=c;j++){
        	cin>>a[i][j];
            if(i==1||i==c||j==1||j==b){
                sum+=a[i][j];
            }
        }
    }
    cout<<sum;
}