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;
using System.Linq;
using System.Collections.Generic;
using System.Text;
using System.Numerics;

namespace abc179
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
            if (File.Exists("input.txt"))
            {
                Console.SetIn(new StreamReader("input.txt"));
            }
            solve_abc179B();
            Console.Out.Flush();
        }

        public static void solve_abc179B()
        {
            int t = Convert.ToInt32(Console.ReadLine());
            int cnt = 0;
            int max = 0;
            while (t-- > 0)
            {
                int[] d = Array.ConvertAll(Console.ReadLine().Split(), int.Parse);
                if (d[0] == d[1])
                {
                    cnt++;
                }
                else
                {
                    cnt = 0;
                }
                max = Math.Max(max, cnt);
            }
            Console.WriteLine(max >= 3 ? "Yes" : "No");
        }

        public static void solve_abc179A()
        {
            string s = Console.ReadLine();
            Console.WriteLine(s.EndsWith('s') ? s + "es" : s + "s");
        }
    }
}