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

Index=[-1]*(N+1)
for i,a in enumerate(A):
    Index[a]=i

Opened=[0]*(N+1)
X=0
for a in range(1,N+1):
    j=Index[a]
    if Opened[j+1]==0:
        X+=1
        Opened[j]=1

print(X)