import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class No3558 {
	
	public static String[][] str;
	public static boolean[][] tf;

	public static void main(String[] args) throws IOException{
		
		String[] strings = readStr();
		int n = Integer.parseInt(strings[0]);
		
		str = new String[n][n*2];
		for(int i = 1;i <= n;i++) {
			str[i-1] = strings[i].split(""); 
		}
		int count = getXYList2();

		System.out.println(count);
		

	}
	
	public static int getXYList2(){
		
		ArrayList<Integer[]> Lary = new ArrayList<Integer[]>();
		ArrayList<Integer[]> Rary = new ArrayList<Integer[]>();
		Integer[] l,r;
		int count = 0;
		
		int startx = 0;
		
		for(int i = 0;i < str.length;i++) {
			for(int j = 0;j < str.length;j++) {
				
				if("#".equals(str[i][j])) {
					l = new Integer[2];
					l[0] = i;
					l[1] = j;
					Lary.add(l);
				}
				
				if(".".equals(str[i][j + str.length])) {
					r = new Integer[2];
					r[0] = i;
					r[1] = j + str.length;
					Rary.add(r);
				}
				
				if(!Lary.isEmpty() && !Rary.isEmpty()) {
					l = Lary.removeFirst();
					r = Rary.removeFirst();
					count += Math.abs(r[0] - l[0]) + Math.abs(r[1] - l[1]);
					
				}
			}
		}
		
		return count;
	}

	public static String[] readStr() throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		ArrayList<String> list = new ArrayList<>();

		do {
			list.add(br.readLine());
		}while(br.ready());

		br.close();

		String[] text = new String[list.size()];
		list.toArray(text);

		return text;

	}

}