codeforces 231A.Team

活动地址：CSDN21天学习挑战赛

作者：zhenyi

子专栏：codeforces800

专栏：codeforces

A. Team

time limit per test2 seconds

memory limit per test256 megabytes

inputstandard input

outputstandard output

One day three best friends Petya, Vasya and Tonya decided to form a team and take part in programming contests. Participants are usually offered several problems during programming contests. Long before the start the friends decided that they will implement a problem if at least two of them are sure about the solution. Otherwise, the friends won't write the problem's solution.

This contest offers n problems to the participants. For each problem we know, which friend is sure about the solution. Help the friends find the number of problems for which they will write a solution.

Input

The first input line contains a single integer n (1 ≤ n ≤ 1000) — the number of problems in the contest. Then n lines contain three integers each, each integer is either 0 or 1. If the first number in the line equals 1, then Petya is sure about the problem's solution, otherwise he isn't sure. The second number shows Vasya's view on the solution, the third number shows Tonya's view. The numbers on the lines are separated by spaces.

Output

Print a single integer — the number of problems the friends will implement on the contest.

Examples

input

3 1 1 0 1 1 1 1 0 0

output

2

input

2 1 0 0 0 1 1

output

1

Note

In the first sample Petya and Vasya are sure that they know how to solve the first problem and all three of them know how to solve the second problem. That means that they will write solutions for these problems. Only Petya is sure about the solution for the third problem, but that isn't enough, so the friends won't take it.

In the second sample the friends will only implement the second problem, as Vasya and Tonya are sure about the solution.

 题意：

        一天，三个最好的朋友Petya, Vasya和Tonya决定组成一个团队，参加编程比赛。在编程比赛中，参赛者通常会遇到一些问题。在开始之前很久，朋友们就决定，如果至少有两个人确定解决方案，他们将实现一个问题。否则，朋友不会写出问题的解决方案。

        这场比赛为参赛者提供了n个问题。对于我们所知道的每一个问题，哪个朋友对解决方案有把握。帮助你的朋友找出他们可以写出解决方案的问题的数量。

#include<iostream>
using namespace std;

int main()
{
	int a,b,c,sum = 0,n;
	cin >> n;
	while(n--)
	{
		cin >> a >> b >> c;
		if(a + b + c > 1)
			sum++;
	}
	cout << sum;
	return 0;
}

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