import java.util.Scanner;

public class HelloWorld {

	    public static void main(String[] args) throws Exception {
	    		Scanner sc = new Scanner(System.in);
	            int n = sc.nextInt();
	            int[] ai = new int[n];
	            int[] bi = new int[n];
	            for (int i = 0; i < n; i++) {
	            	ai[i] = sc.nextInt();
	            }
	            for (int i =0; i < n; i++) {
	            	bi[i]=sc.nextInt();
	            }
	            sc.close();

	            int count = 0;

	            for (int i = 0; i < n; i ++) {
	            	if (ai[i] != bi[i]) {
	            		for (int j = i; j < n; j ++) {
	            			if (ai[j] == bi[j]) {
	            				count ++;
	            				i = j;
	            				break;
	            			}
	            			if (j == n-1) {
	            				count ++;
	            				i = j ;
	            				break;
	            			}
	            		}
	            	}

	            }
	            System.out.println(count);
}}