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 = 0;
		
		ArrayList<Integer[]> Llist = getXYList("#");
		ArrayList<Integer[]> Rlist = getXYList(".");
		
		while(!Llist.isEmpty()) {
			Integer[] l = Llist.removeFirst();
			Integer[] r = Rlist.removeFirst();

			count += Math.abs(r[0] - l[0]) + Math.abs(r[1] - l[1]);
		}

		System.out.println(count);
		

	}

	public static ArrayList<Integer[]> getXYList(String bw){
		ArrayList<Integer[]> ary = new ArrayList<Integer[]>();
		Integer[] p;
		
		int startx = 0;
		
		if(".".equals(bw)) {
			startx = str.length;
		}
		
		for(int i = 0;i < str.length;i++) {
			for(int j = startx;j < str.length+startx;j++) {
				if(bw.equals(str[i][j])) {
					p = new Integer[2];
					p[0] = i;
					p[1] = j;
					ary.add(p);
				}
			}
		}
		
		return ary;
	}
	
	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;

	}

}