#yuki921

n=int(raw_input())
a=map(int,raw_input().split())
res=1
f=True
for i in range(1,n):
 if a[i]!=a[i-1]:
  if f:
   f=False
  else:
   res+=1
   f=True
 else:
  res+=1
  f=True
print res