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# include <iostream>
# include <math.h>
# include <cstring>
using namespace std ;
int x [ 601 ] [ 601 ] ;
int F [ 601 ] [ 601 ] ;
int line [ 601 ] = { 0 } ;
/*
一维index表示行数，
*/
int main ( )
{
int n , L , r , t ;
cin > > n > > L > > r > > t ;
for ( int i = 0 ; i < = n ; i + + )
{
memset ( line , 0 , sizeof ( line ) ) ;
for ( int j = 0 ; j < = n ; j + + )
{
if ( i = = 0 | | j = = 0 )
F [ i ] [ j ] = 0 ;
else
{
cin > > x [ i ] [ j ] ;
line [ j ] = line [ j - 1 ] + x [ i ] [ j ] ;
F [ i ] [ j ] = line [ j ] + F [ i - 1 ] [ j ] ;
}
}
}
// for (int i = 0; i <= n; i++)
// {
// for (int j = 0; j <= n; j++)
// {
// cout << F[i][j] << " ";
// }
// cout << endl;
// }
int count = 0 ;
for ( int i = 1 ; i < = n ; i + + )
{
for ( int j = 1 ; j < = n ; j + + )
{
int i_up = ( i - r - 1 > 0 ) ? i - r - 1 : 0 ;
int i_down = ( i + r < = n ) ? i + r : n ;
int j_left = ( j - r - 1 > 0 ) ? j - r - 1 : 0 ;
int j_right = ( j + r < = n ) ? j + r : n ;
double average = ( F [ i_down ] [ j_right ] + F [ i_up ] [ j_left ] - F [ i_down ] [ j_left ] - F [ i_up ] [ j_right ] ) ;
// cout << average << " ";
// cout << (i_down - i_up) * (j_right - j_left) << " ";
// if ((i_down - i_up) * (j_right - j_left) == 24)
// {
// cout << i << " " << j << " " << r << endl;
// }
average = average / ( i_down - i_up ) / ( j_right - j_left ) ;
if ( average < = t )
count + + ;
}
// cout << endl;
}
cout < < count ;
return 0 ;
}
