N = int(input())
A = list(map(int, input().split()))

ans = 0
prev = 0 # 0:餅, 1:ずんだ餅
for i in range(N):
    if i == 0 or prev == 0 or A[i-1] == A[i]:
        ans += 1
        prev = 1
    else:
        prev = 0
print(ans)