n=int(input())
a=list(map(int,input().split()))
c=[]
for i in range(n):
  c.append((a[i],i))
c.sort()
b=[0]*n
for i in range(n):
  b[c[i][1]]=i
ans=0
pointer=0
if b[n-1]!=n-1:
  ans+=1
for i in range(n-2,-1,-1):
  if pointer>=i:
      break
  if b[i]+1!=b[i+1]:
    if b[i+1]==pointer:
      pointer+=1
    else:
      ans+=1
print(ans)