import java.util.*;
 

public class Main {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n= sc.nextInt();
		char[][] kekka = new char[n][n];
		int[] kazu = new int[n];
		for(int i=0;i<n;i++){
			String ss=sc.next();
			for(int j=0;j<n;j++){
				kekka[i][j]=ss.charAt(j);
				if(kekka[i][j]=='o') kazu[i]++;
			}
		}
		for(int i=0;i<n;i++){
			for(int j=0;j<n;j++){
				if(kekka[i][j]=='-'){
					if(i==0){
						kekka[i][j]='o';
						kekka[j][i]='x';
						kazu[0]++;
					}else{
						if(kazu[i]>kazu[j]){
							kekka[i][j]='x';
							kekka[j][i]='o';
							kazu[j]++;
						}else{
							kekka[i][j]='o';
							kekka[j][i]='x';
							kazu[i]++;
						}
					}
				}
			}
		}
		int aa=kazu[0];
		Arrays.sort(kazu);
		int ans=1;
		int now=kazu[n-1];
		for(int i=n-1;i>=0;i--){
			if(kazu[i]<now){
				ans++;
				now=kazu[i];
			}
			if(now==aa){
				break;
			}
		}
		System.out.println(ans);
	}
}