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

index = [None] * N

for i in range(N):
    A[i] -= 1

for i in range(N):
    index[A[i]] = i

ok = [True] * N

ans = 0
for i in range(N):
    if not ok[index[i]]:
        continue
    ok[index[i]] = False
    if index[i] > 0:
        ok[index[i] - 1] = False
    ans += 1

print(ans)