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++ (GCC 9.2.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl "\n"
const int dx[] = { -1 , -1 , -1 , 0 , 0 , 0 , 1 , 1 , 1 };
const int dy[] = { -1 , 0 , 1 , -1 , 0 , 1 , -1 , 0 , 1 };
#define NN 8010000
#define TC int t;cin>>t;for(int T=1;T<=t;T++)
#define mod 1000000007
#define PI acos(-1)
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define mem(a,n) memset(a,n,sizeof(a))
void AIA() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); }
//cout<<fixed<<setprecision(20);
// freopen("stand.in","r",stdin);
// freopen("stand.out","w",stdout);
bool isprime(ll n) {
	for (ll i = 2; i * i <= n; i++) {
		if (n % i == 0)return 0;
	}
	return (n!=1);
}
ll gcd(ll x, ll y)
{
	return (y == 0 ? x : gcd(y, x % y));
}
ll lcm(ll a, ll b) {
	return a / gcd(a, b) * b;
}
ll rem(int x, int N){
	return (x % N + N) % N;
}

int main()
{
	//cout<<fixed<<setprecision(20);
	//freopen("Input.txt.txt", "r", stdin);
	//freopen("Output.txt.txt", "w", stdout);
	AIA();
	int n, c = 0;
	cin>>n;
	while(n--){
		int a, b;
		cin>>a>>b;
		if(a == b)c++;
		else c = 0;
		if(c == 3){
			cout<<"Yes";
			return 0;
		}
	}
	cout<<"No";
	return 0;
}