#include<bits/stdc++.h>
using namespace std;
int main(){
	//freopen("image.in","r",stdin);
	//freopen("image.out","w",stdout);
	int h,w,c=1,d=1,a[1000][1000],b[100][100];
	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){
			b[c][d]=(a[i][j]+a[i][j+1]+a[i+1][j]+a[i+1][j+1])/4;
			cout<<b[c][d]<<" ";
			d+=1;
		}
		c+=1;
		d=1;
		cout<<endl;
	}
    return 0;
}
```


```