package main

import (
	"sort"
	"bufio"
	"fmt"
	"os"
	"strconv"
)

var sc, wr = bufio.NewScanner(os.Stdin), bufio.NewWriter(os.Stdout)

func scanString() string { sc.Scan(); return sc.Text() }
func scanInt() int { a,_ := strconv.Atoi(scanString()); return a }
func scanInt64() int64 { a,_ := strconv.ParseInt(scanString(),10,64); return a }
func scanFloat64() float64 { a,_ := strconv.ParseFloat(scanString(),64); return a }

func scanInts(n int) []int {
	res := make([]int, n); for i := 0; i < n; i++ { res[i] = scanInt() }; return res
}

func abs(a int) int { if a<0 { return -a }; return a }
func min(a,b int) int { if a<b { return a }; return b }
func max(a,b int) int { if a>b { return a }; return b }

//•*¨*•.¸¸♪Main•*¨*•.¸¸♪(　-ω-)ノ　(　・ω・)

func main() {
	sc.Split(bufio.ScanWords)
	sc.Buffer(make([]byte, 10000), 1000000)

	n := scanInt()
	m := scanInt()
	k := scanInt()
	op := scanString()

	ans := 0

	b := scanInts(m)
	a := scanInts(n)

	sort.Ints(a)
	sort.Ints(b)
	// fmt.Println(b)

	for i := 0; i < n; i++ {
		var f func(j int) bool
		if op == "+" {
			f = func(j int) bool { return k <= b[j]+a[i] }
		} else {
			f = func(j int) bool { return k <= b[j]*a[i] }
		}
		index := sort.Search(len(b),f)
		ans += m - index
		// fmt.Println(a[i],index)
	}
	

	fmt.Println(ans)
}