import java.io.*;
import java.util.*;
import java.awt.geom.*;

/**
 * Solution to Blur
 * 
 * @author vanb
 */
public class blur_vanb
{
    public Scanner sc;
    public PrintStream ps;
        
    /**
     * Driver.
     * @throws Exception
     */
    public void doit() throws Exception
    {
        sc = new Scanner( System.in );
        ps = System.out;
        
        int w = sc.nextInt();
        int h = sc.nextInt();
        int b = sc.nextInt();
        
        // We're going to store b+1 images, one for each blurring actions.
        // It's more memory efficient to just keep 2 and swap them, but 
        // that requires more programming, and the numbers are small enough
        // that it shouldnn't be a problem.
        int image[][][] = new int[h][w][b+1];
        for( int i=0; i<h; i++ ) for( int j=0; j<w; j++ )
        {
            // We'll put the starting image at image[*][*][b].
            // The final image will end up at image[*][*][0].
            image[i][j][b] = sc.nextInt();
        }
        
        // Blur b times. We'll keep the sum of the 9 cells around a pixel, rather than the average.
        // The average is a bit of a red herring. The integer sum will be all we need 
        // to check uniqueness. The average will be a real number, and comparing reals for equality
        // is problematic.
        for( int k=b; k>0; k-- ) for( int i=0; i<h; i++ ) for( int j=0; j<w; j++ )
        {
            int sum = 0;
            for( int di=-1; di<=1; di++ ) for( int dj=-1; dj<=1; dj++)
            {
                sum += image[(i+di+h)%h][(j+dj+w)%w][k];
            }
            image[i][j][k-1] = sum;
        }
        
        // We're really lazy, so we'll use a HashSet to count unique colors.
        HashSet<Integer> colors = new HashSet<Integer>();
        for( int i=0; i<h; i++ ) for( int j=0; j<w; j++ )
        {
            colors.add( image[i][j][0] );
        }
        
        ps.println( colors.size() );

        
    }
    
    /**
     * @param args
     */
    public static void main( String[] args ) throws Exception
    {
        new blur_vanb().doit();        
    }   
}