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;

namespace ConsoleApp1
{
    class ABC179B
    {
        // https://atcoder.jp/contests/abc179/tasks/abc179_b
        static void Main(string[] args)
        {
            int N = Int32.Parse(Console.ReadLine());

            int x = 0;
            bool result = false;

            for (int i = 0; i < N; i++)
            {
                var ab = Console.ReadLine().Split();
                int a = Int32.Parse(ab[0]);
                int b = Int32.Parse(ab[1]);

                if (a == b)
                {
                    x++;
                    if (x >= 3)
                    {
                        result = true;
                    }
                }
                else
                {
                    x = 0;
                }
            }
            Console.WriteLine(result ? "Yes" : "No");
        }
    }
}