水

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _231A
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int solve = 0;
            while(n-- != 0)
            {
                int sure = Console.ReadLine().Split().Select(i => int.Parse(i)).ToArray().Count(i => i == 1);
                if (sure >= 2)
                {
                    solve++;
                }
            }
            Console.WriteLine(solve);
        }
    }
}