n=int(input())
a=list(map(int,input().split()))
dp=[0]*(n+1)
dp[1]=1
for i in range(1,n):
  if a[i]==a[i-1]:
    dp[i+1]=dp[i]+1
  else:
    dp[i+1]=max(dp[i],dp[i-1]+1)
print(dp[-1])