import java.util.*;
import java.io.*;
import java.io.BufferedReader;
import java.awt.Point;

public class mincross{
	public static final String TASKNAME = "mincross";
	public static long mod= 1000000007;
	public static Debug db;

	public static void main(String[] args) throws IOException {
//		InputReader in = new InputReader(System.in);
//		PrintWriter out = new PrintWriter(System.out);
		InputReader in = new InputReader(new FileInputStream(TASKNAME+".in"));
		PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(TASKNAME+".out")));
		Autocompletion solver = new Autocompletion();
		db=new Debug(System.getSecurityManager()==null);
		solver.solve(1, in, out);
		out.close();
	}
	static class Autocompletion {

		public void solve(int testNumber, InputReader in, PrintWriter out) {
			int n=in.nextInt();
			int l[]=in.nextIntArr(n);
			int r[]=in.nextIntArr(n);
			int llook[]=new int[n];
			int rlook[]=new int[n];
			for(int i=0;i<n;i++) {
				r[i]--;
				l[i]--;
			}
			for(int i=0;i<n;i++) {
				llook[l[i]]=i;
				rlook[r[i]]=i;
			}
			long cnt=0;
			bit bit=new bit(n);
			for(int i=0;i<n;i++) {
				cnt+=i-bit.sum(rlook[l[i]]);
				bit.update(rlook[l[i]], 1);
			}
			long min=Long.MAX_VALUE;
			for(int i=n-1;i>=0;i--){
				cnt+=llook[r[i]]-(n-1-llook[r[i]]);
				min=Math.min(min,cnt);
			}
			out.println(min);
		}
	}
	static class bit {
	 	//1 indexed
		public int[] tree;
		public bit(int n) {
			tree = new int[n+5];
		}
		public void update(int index, int val) {
			index++;
			while(index < tree.length) {
				tree[index] += val;
				index += index & -index;
			}
		}
		public long sum(int i) {
            long ans = 0;
            while (i > 0) {
                ans += tree[i];
                i = i - (i & (-i));
            }
            return ans;
        }

        public long queryRange(int i, int j) {
            return sum(j) - sum(i - 1);
        }
	}
	static class Pair implements Comparable<Pair>{
		int x;
		int y;
		Pair(int a, int b){
			x=a;
			y=b;
		}
		@Override
		public int compareTo(Pair arg0) {
			if(arg0.x!=x)return x-arg0.x;
			return y-arg0.y;
		}
	}
	static class Triple implements Comparable<Triple>{
		int x;
		int y;
		int z;
		Triple(int a, int b, int c){
			x=a;
			y=b;
			z=c;
		}
		@Override
		public int compareTo(Triple arg0) {
			if(arg0.x!=x)return x-arg0.x;
			return y-arg0.y;
		}
	}

	static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }
        public long nextLong() {
        	return Long.parseLong(next());
        }
        public int[] nextIntArr(int n) {
        	int arr[]=new int[n];
        	for(int i=0;i<n;i++) {
        		arr[i]=this.nextInt();
        	}
        	return arr;
        }
    }
	public static class Debug {
        private boolean allowDebug;

        public Debug(boolean allowDebug) {
            this.allowDebug = allowDebug;
        }

        private void outputName(String name) {
            System.out.print(name + " = ");
        }

        public void debug(String name, int x) {
            if (!allowDebug) {
                return;
            }

            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, long x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, double x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, int[] x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.toString(x));
        }

        public void debug(String name, long[] x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.toString(x));
        }

        public void debug(String name, double[] x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.toString(x));
        }

        public void debug(String name, Pair[] x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            StringBuilder sb = new StringBuilder("[");
            int cnt=0;
            for(Pair y:x) {
            	sb.append("("+y.x+","+y.y+')');
            	if (cnt != x.length-1)sb.append(", ");
            	cnt++;
            }
            System.out.println(sb.append("]").toString());
        }

        public void debug(String name, Object x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, Object... x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.deepToString(x));
        }
    }
}