import java.util.*;
import java.lang.*;
import java.io.*;

class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int [][] gr = new int [1001][1001]; 
		Scanner in = new Scanner(System.in);
		int n = in.nextInt(); 
		int ans = 0; 
		for (int i=0; i<n; i++) {
			for (int j=0; j<n; j++) {
				gr[i][j] =  in.nextInt(); 
			}
		}
		for (int i=0; i<n; i++) {
			int cnt = 0; 
			for (int j=0; j<n; j++) {
				if (gr[i][j] == 1) cnt++;
			}
			if (cnt==1) ans++;
		}
		System.out.println(ans);
	}
}