package main

import (
	"bufio"
	"fmt"
	"log"
	"math"
	"os"
	"strconv"
	"strings"
)

func main() {
	scanner := makeWordScanner()
	n := eGetInt(scanner)
	m := eGetInt(scanner)
	k := eGetInt(scanner)
	asum := make([]int64, n+1)
	bsum := make([]int64, m+1)
	for i := 1; i < n+1; i++ {
		a := eGetInt(scanner)
		asum[i] = asum[i-1] + int64(a)
	}
	for i := 1; i < m+1; i++ {
		b := eGetInt(scanner)
		bsum[i] = bsum[i-1] + int64(b)
	}
	max := 0
	startb := len(bsum) - 1
	for acount := 0; acount < len(asum); acount++ {
		var remain int64 = int64(k)
		remain -= asum[acount]
		if remain < 0 {
			continue
		}
		for bcount := startb; bcount >= 0; bcount-- {
			var remain2 int64 = int64(remain)
			remain2 -= bsum[bcount]
			if remain2 < 0 {
				continue
			}
			var bookcount = acount + bcount
			if max < bookcount {
				max = bookcount
			}
			startb = bcount
			break
		}
	}
	fmt.Println(max)
}

// func main() {
// 	scanner := makeWordScanner()
// 	n := eGetInt(scanner)
// 	m := eGetInt(scanner)
// 	k := eGetInt(scanner)
// 	as := make([]int, n+1)
// 	asum := make([]int, n+1)
// 	bs := make([]int, m+1)
// 	bsum := make([]int, m+1)
// 	for i := 1; i < n+1; i++ {
// 		as[i] = eGetInt(scanner)
// 		asum[i] = asum[i-1] + as[i]
// 	}
// 	for i := 1; i < m+1; i++ {
// 		bs[i] = eGetInt(scanner)
// 		bsum[i] = bsum[i-1] + bs[i]
// 	}
// 	var max int64
// 	for acount := 0; acount < len(asum); acount++ {
// 		remain := k
// 		remain -= asum[acount]
// 		if remain < 0 {
// 			continue
// 		}
// 		// 全部読める
// 		var bookcount int64
// 		bookcount = int64(acount)
// 		if remain == 0 {
// 			// Bは1冊も読めない
// 		} else if remain >= bsum[len(bsum)-1] {
// 			// Bを全部読める
// 			bookcount = bookcount + int64(len(bsum)-1)
// 		} else {
// 			left := 0
// 			right := len(bsum) - 1
// 			for right-left > 1 {
// 				mid := (left + right) / 2
// 				if remain >= bsum[mid] {
// 					// 読める
// 					left = mid
// 				} else {
// 					// 読めない.
// 					right = mid
// 				}
// 			}
// 			bookcount = bookcount + int64(left)
// 		}
// 		if max < bookcount {
// 			max = bookcount
// 		}
// 	}
// 	fmt.Println(max)
// }

////////////////////////////////////////////////////////////////////////////////
// ライブラリ
////////////////////////////////////////////////////////////////////////////////
const (
	TooLarge = math.MaxInt64
	TooSmall = math.MinInt64
)

func makeScanner(maxByte int) *bufio.Scanner {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Buffer(make([]uint8, 0, 8192), maxByte)
	return scanner
}
func makeCharScanner() *bufio.Scanner {
	scanner := makeScanner(8192)
	scanner.Split(bufio.ScanRunes)
	return scanner
}
func makeWordScanner() *bufio.Scanner {
	scanner := makeScanner(8192)
	scanner.Split(bufio.ScanWords)
	return scanner
}
func eGetLine(r *bufio.Scanner) string {
	if r.Scan() {
		return r.Text()
	}
	err := r.Err()
	if err != nil {
		log.Fatal(err)
	}
	// EOF
	return ""
}
func eGetInt(r *bufio.Scanner) int {
	line := eGetLine(r)
	return eAtoi(line)
}
func eGetInt64(r *bufio.Scanner) int64 {
	line := eGetLine(r)
	return eAtoInt64(line)
}
func eGetFields(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Fields(line)
}
func eGetInts(r *bufio.Scanner) []int {
	fields := eGetFields(r)
	ints := make([]int, len(fields))
	for i := 0; i < len(ints); i++ {
		ints[i] = eAtoi(fields[i])
	}
	return ints
}
func eGetInt64s(r *bufio.Scanner) []int64 {
	fields := eGetFields(r)
	ints := make([]int64, len(fields))
	for i := 0; i < len(ints); i++ {
		ints[i] = eAtoInt64(fields[i])
	}
	return ints
}
func eGetChars(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Split(line, "")
}
func eAtoi(s string) int {
	n, err := strconv.Atoi(s)
	if err != nil {
		log.Fatal(err)
	}
	return n
}
func eAtoInt64(s string) int64 {
	n, err := strconv.ParseInt(s, 10, 64)
	if err != nil {
		log.Fatal(err)
	}
	return n
}
func pow(a, n int) int {
	if n == 0 {
		return 1
	}
	if n == 1 {
		return a
	}
	if n%2 == 1 {
		return pow((a*a), n/2) * a
	}
	return pow((a * a), n/2)
}
func pow5(a int, memo map[int]int) int {
	v, ok := memo[a]
	if ok {
		return v
	}

	b := a * a
	c := b * b
	memo[a] = c * 5
	return memo[a]
}
func powMod(a, n, mod int) int {
	if n == 0 {
		return 1 % mod
	}
	if n == 1 {
		return a % mod
	}
	if n%2 == 1 {
		return powMod((a*a)%mod, n/2, mod) * a % mod
	}
	return powMod((a*a)%mod, n/2, mod)
}

func factoricalMod(n, count, mod int) int {
	if count == 1 {
		return n % mod
	}
	return (n % mod) * (factoricalMod(n-1, count-1, mod)) % mod
}

func combinationMod(n, a, mod int) int {
	x := factoricalMod(n, a, mod)
	y := factoricalMod(a, a, mod)
	y = powMod(y, mod-2, mod)
	return ((x % mod) * (y % mod)) % mod
}
func countBitOfOn(i, numbits int) int {
	count := 0
	var bit uint64
	for bit = 0; bit < uint64(numbits); bit++ {
		t := 1 << bit
		if i&t > 0 {
			count++
		}
	}
	return count
}

type ints []int

func ToString(slice []int) string {
	format := fmt.Sprint(slice)
	return fmt.Sprint(format[1 : len(format)-1])
}

type String string

func reverseS(s []int) {
	for i := 0; i < len(s)/2; i++ {
		s[i], s[len(s)-1-i] = s[len(s)-1-i], s[i]
	}
}
func reverseB(s []byte) {
	for i := 0; i < len(s)/2; i++ {
		s[i], s[len(s)-1-i] = s[len(s)-1-i], s[i]
	}
}

func (s String) revese() string {
	b := []byte(s)
	for i := 0; i < len(b)/2; i++ {
		b[i], b[len(b)-1-i] = b[len(b)-1-i], b[i]
	}
	return string(b)
}
func contains(n int, slice []int) bool {
	for _, e := range slice {
		if e == n {
			return true
		}
	}
	return false
}


Measured memory_bytes: 8344