MOD = 10 ** 9 + 7
INF = 10 ** 10
import sys
sys.setrecursionlimit(100000000)
dy = (-1,0,1,0)
dx = (0,1,0,-1)
from collections import deque
from heapq import heapify,heappush,heappop

def main():
    n = int(input())
    a = list(map(int,input().split())) + [-1]

    ans = (n + 1)//2
    cnt = 0
    i = 0
    while i < n:
        if a[i] == a[i + 1]:
            i += 1
            cnt += 1
        else:
            i += 2
            cnt += 1 
    ans = max(ans,cnt)
    print(ans)


if __name__ =='__main__':
    main()