#include<bits/stdc++.h>
using namespace std;
int main(){
    int n=1005;
    int a[n][n];
    int h,w;
    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){
           int s=a[i][j]+a[i+1][j]+a[i][j+1]+a[i+1][j+1]; 
           cout<<s/4<<" ";
        }
        cout<<endl;
    }
    return 0;
}

#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;
}
```


```

#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;
}
```


```

#include <bits/stdc++.h>
using namespace std;
int n, m, a[1005][1005];
bool k;
int main()
{
	cin >> n >> m;
	for (int i = 1;i <= n;i++)
	{
		for (int j = 1;j <= m;j++)
		{
			cin >> a[i][j];
		}
	}
	for (int i = 2;i <= n;i += 2)
	{
		for (int j = 2;j <= m;j += 2)
		{
			cout << (a[i - 1][j - 1] + a[i - 1][j] + a[i][j - 1] + a[i][j]) / 4 << " ";
		}
		cout << endl;
	}
	return 0;
}