n = int(input())  # Reading the number of problems
count = 0

for _ in range(n):
    votes = list(map(int, input().split()))
    if sum(votes) >= 2:  # At least 2 friends should be sure about the solution
        count += 1

print(count)

using System;

class Program
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int count = 0;

        for (int i = 0; i < n; i++)
        {
            string[] votes = Console.ReadLine().Split();
            int sureCount = int.Parse(votes[0]) + int.Parse(votes[1]) + int.Parse(votes[2]);
            if (sureCount >= 2)
            {
                count++;
            }
        }

        Console.WriteLine(count);
    }
}

package main

import (
    "fmt"
)

func main() {
    var n, count int
    fmt.Scan(&n)

    for i := 0; i < n; i++ {
        var a, b, c int
        fmt.Scan(&a, &b, &c)
        if a+b+c >= 2 {
            count++
        }
    }

    fmt.Println(count)
}

n = gets.to_i
count = 0

n.times do
  votes = gets.split.map(&:to_i)
  count += 1 if votes.sum >= 2
end

puts count

use std::io;

fn main() {
    let mut input = String::new();
    io::stdin().read_line(&mut input).unwrap();
    let n: usize = input.trim().parse().unwrap();
    
    let mut count = 0;
    for _ in 0..n {
        let mut input = String::new();
        io::stdin().read_line(&mut input).unwrap();
        let votes: Vec<i32> = input.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
        if votes.iter().sum::<i32>() >= 2 {
            count += 1;
        }
    }
    
    println!("{}", count);
}

fun main() {
    val n = readLine()!!.toInt()
    var count = 0

    repeat(n) {
        val votes = readLine()!!.split(" ").map { it.toInt() }
        if (votes.sum() >= 2) {
            count++
        }
    }

    println(count)
}