import sys
input=lambda: sys.stdin.readline().rstrip()

n=int(input())
A=[int(i) for i in input().split()]
ans=0
cur=0
for i,a in enumerate(A):
  if cur==0:
    ans+=1
    cur=1
  else:
    cur=0
    if a==A[i-1]:
      ans+=1
      cur=1
print(ans)