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