import java.io.BufferedReader
import java.io.InputStream
import java.io.InputStreamReader
import java.io.PrintWriter
import java.util.*

class BIT(n: Int) {
    private val N =
            if (Integer.highestOneBit(n) == n) n
            else Integer.highestOneBit(n) shl 1

    private val bit = LongArray(N + 1)

    fun sum(i: Int): Long {
        var x = i
        var s = 0L
        while(x > 0) {
            s += bit[x]
            x -= x and -x
        }
        return s
    }

    fun add(i: Int, a: Long) {
        var x = i + 1
        while(x <= N) {
            bit[x] += a
            x += x and -x
        }
    }
}

fun PrintWriter.solve(sc: FastScanner) {
    val n = sc.nextInt()
    val a = Array(n) { sc.nextInt() }
    val b = Array(n) { sc.nextInt() }
    val new = Array(n + 1) { 0 }
    for (i in 0 until n) {
        new[b[i]] = i + 1
    }
    for (i in 0 until n) {
        a[i] = new[a[i]]
    }
    val bit = BIT(n)
    var ans = 0L
    for (i in 0 until n) {
        ans += i - bit.sum(a[i])
        bit.add(a[i], 1)
    }
    println(ans)
}

fun main() {
    val writer = PrintWriter(System.out, false)
    writer.solve(FastScanner(System.`in`))
    writer.flush()
}

class FastScanner(s: InputStream) {
    private var st = StringTokenizer("")
    private val br = BufferedReader(InputStreamReader(s))

    fun next(): String {
        while (!st.hasMoreTokens()) st = StringTokenizer(br.readLine())

        return st.nextToken()
    }

    fun nextInt() = next().toInt()
    fun nextLong() = next().toLong()
    fun nextLine() = br.readLine()
    fun nextDouble() = next().toDouble()
    fun ready() = br.ready()
}