#include<bits/stdc++.h>
using namespace std;
int main(){
	//freopen("image.in","r",stdin);
	//freopen("image.out","w",stdout);
	int h,w,a[1000][1000];
	cin>>h>>w;
	for(int i=1;i<=h;i++){
		for(int j=1;j<=w;j++){
			cin>>a[i][j];
		}
	}
	for(int i=1;i<=h;i+=2){
		for(int j=1;j<=w;j+=2){
			cout<<(a[i][j]+a[i][j+1]+a[i+1][j]+a[i+1][j+1])/4<<" ";
		}
		cout<<endl;
	}
    return 0;
}
```


```