N = int(input())
lsR = list(map(lambda x:int(x)-1,input().split()))+[0]

now = 0
nextto = lsR[0]
cnt = 1
while True:
    if nextto == N-1:
        break
    ne = nextto
    for j in range(now,ne+1):
        nextto = max(nextto,lsR[j])
    now = ne
    cnt += 1
print(cnt)