Problem:
Score : 200 points

Problem Statement

Tak performed the following action N times: rolling two dice.
The result of the i-th roll is D_{i,1} and D_{i,2}.

Check if doublets occurred at least three times in a row.
Specifically, check if there exists at lease one i such that D_{i,1}=D_{i,2}, D_{i+1,1}=D_{i+1,2} and D_{i+2,1}=D_{i+2,2} hold.

Constraints

3 \leq N \leq 100

1\leq D_{i,j} \leq 6

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
D_{1,1} D_{1,2}
\vdots
D_{N,1} D_{N,2}

Output

Print Yes if doublets occurred at least three times in a row. Print No otherwise.

Sample Input 1

5
1 2
6 6
4 4
3 3
3 2

Sample Output 1

Yes

From the second roll to the fourth roll, three doublets occurred in a row.

Sample Input 2

5
1 1
2 2
3 4
5 5
6 6

Sample Output 2

No

Sample Input 3

6
1 1
2 2
3 3
4 4
5 5
6 6

Sample Output 3

Yes

Solution in C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.IO;

namespace ConsoleApp8
{
	class Program
	{
		static void Main(string[] args)
		{
			int n = int.Parse(Console.ReadLine());

			int[,] d = new int[n, 3];
			int cnt = 0;

			for (int i = 0; i <= n - 1; i++)
            {
				string[] dice = Console.ReadLine().Split(' ');
				d[i, 0] = int.Parse(dice[0]);
				d[i, 1] = int.Parse(dice[1]);
				if (d[i, 0] == d[i, 1])
				{
					cnt++;
					if (cnt >= 3)
					{
						Console.WriteLine("Yes");
						break;
					}
				}
				else
				{
					cnt = 0;
				}
			}
			if (cnt < 3)
			{
				Console.WriteLine("No");
			}
		}
	}
}