#include <stdio.h>

#define MAXN 100


int table[MAXN];
int pos[MAXN];

int main(void) {
  int i,j,n,c,count,tmp;

  while (scanf("%d\n",&n)==1) {
    for (i=0;i<n;i++) {
      scanf("%d",&c);
      table[c]=i;
    }
    for (i=0;i<n;i++) {
      scanf("%d",&c);
      pos[i]=table[c];
    }
    count=0;
    for (i=n-1;i>=0;i--) {
      for (j=1;j<=i;j++) {
	if (pos[j-1]>pos[j]) {
	  tmp=pos[j-1];
	  pos[j-1]=pos[j];
	  pos[j]=tmp;
	  count++;
	}
      }
    }
    printf("%d\n",count);
  }
  return 0;
}