#include <bits/stdc++.h>
using namespace std;
int m,n,a[1002][1002];
long long s;
int h[4]={-1,0,1,0};
int c[4]={0,1,0,-1};
void nhap()
{
cin>>m>>n;
for(int i=1;i<=m;i++)
for(int j=1;j<=n;j++)
cin>>a[i][j];
}
void giai()
{
for(int i=1;i<=m;i++)
{
for(int j=1;j<=n;j++)
{
for(int k=0;k<=3;k++)
if(a[i+h[k]][j+c[k]]<a[i][j])
s=s+a[i][j]-(a[i+h[k]][j+c[k]]);
}
}
s=s+m*n;
cout<<s;
}
int main()
{
nhap();
giai();
}
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