N = int(input())
lsa = list(map(int,input().split()))
used = [False]*(N)
so = [0]*(N)
for i in range(N):
    so[lsa[i]-1] = i

ans = 0
for i in range(N):
    if used[so[i]]:
        continue
    used[so[i]] = True
    if so[i] != 0:
        used[so[i]-1] = True
    ans += 1
print(ans)