#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b,c,d,f=0;
	cin>>a>>b>>c>>d;
	int e[a][b];
	for(int i=0;i<a;i++)
		for(int j=0;j<b;j++)
			cin>>e[i][j];
	for(int i=0;i<a;i++)
		for(int j=0;j<b;j++)
		{
			if(i==c-1&&j==d) f+=e[i][j];
			if(i==c+1&&j==d) f+=e[i][j];
			if(i==c&&j==d-1) f+=e[i][j];
			if(i==c&&j==d+1) f+=e[i][j];
			if(i==c-1&&j==d+1) f+=e[i][j];
			if(i==c-1&&j==d-1) f+=e[i][j];
			if(i==c+1&&j==d+1) f+=e[i][j];
			if(i==c+1&&j==d-1) f+=e[i][j];
		}
	cout<<f;
	return 0;
}