import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner koko = new Scanner(System.in);
        int n = koko.nextInt();
        boolean[][] d = new boolean[n][n];
        String[] s = new String[n];
        int[] game = new int[n];
        int[] win = new int[n];
        int tgame=0;
        for(int i=0; i<n; i++){
            s[i]=koko.next();
            for(int j=0; j<n; j++){
                if(s[i].charAt(j)=='o'){
                    d[i][j]=true;
                    win[i]++;
                    game[i]++;
                }else if(s[i].charAt(j)=='-'){
                    
                }else{
                    d[i][j]=true;
                    game[i]++;
                }
            }
            tgame=tgame+game[i];
        }
        if(game[0]<n){
            for(int i=1; i<n; i++){
                if(!d[0][i]){
                    d[0][i]=true;
                    d[i][0]=true;
                    win[0]++;
                    tgame+=2;
                }
            }
        }
        while(tgame<n*n){
            for(int i=2; i<n; i++){
                for(int j=1; j<i; j++){
                    if(!d[i][j]){
                        d[i][j]=true;
                        d[j][i]=true;
                        if(win[i]==win[0]){
                            win[j]++;
                        }else{
                            win[i]++;
                        }
                        tgame+=2;
                    }
                }
            }
        }
        int point = win[0];
        Arrays.sort(win);
        int rank =1;
        int now = win[n-1];
        if(win[n-1]==point){
            System.out.println(rank);
        }else{
            for(int i=n-2; i>=0; i--){
                if(win[i]!=win[i+1]){
                    rank++;
                }
                if(win[i]==point){
                    System.out.println(rank);
                    break;
                }
            }
        }
    }
}