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 Fortran (GNU Fortran 9.2.1) (judge verdict: Accepted)

program abc68
 implicit none
 integer(8)::N,ia,ib,c=0
 integer(8),allocatable::a(:),b(:)
 read(*,*)N
 allocate(a(N),b(N))
 do ia=1,N
  read(*,*)a(ia),b(ia)
 end do
 do ib=1,N-2
  if(a(ib)==b(ib).and.a(ib+1)==b(ib+1).and.a(ib+2)==b(ib+2))then
   c=1
   exit
  end if
 end do
 if(c==1)then
  print'(a)',"Yes"
 else
  print'(a)',"No"
 end if
 deallocate(a,b)
end program abc68