Problem:
Score : 200 points

Problem Statement

There are N gems. The value of the i-th gem is V_i.

You will choose some of these gems, possibly all or none, and get them.

However, you need to pay a cost of C_i to get the i-th gem.

Let X be the sum of the values of the gems obtained, and Y be the sum of the costs paid.

Find the maximum possible value of X-Y.

Constraints

All values in input are integers.

1 \leq N \leq 20

1 \leq C_i, V_i \leq 50

Input

Input is given from Standard Input in the following format:

N
V_1 V_2 ... V_N
C_1 C_2 ... C_N

Output

Print the maximum possible value of X-Y.

Sample Input 1

3
10 2 5
6 3 4

Sample Output 1

5

If we choose the first and third gems, X = 10 + 5 = 15 and Y = 6 + 4 = 10.
We have X-Y = 5 here, which is the maximum possible value.

Sample Input 2

4
13 21 6 19
11 30 6 15

Sample Output 2

6

Sample Input 3

1
1
50

Sample Output 3

0

Solution in Go (1.6) (judge verdict: Accepted)

package main

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

func readLine(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

func strToInt(str string) []int {
	var ret []int
	for _, s := range strings.Split(str, " ") {
		num, _ := strconv.Atoi(s)
		ret = append(ret, num)
	}
	return ret
}

func main() {
	var n int
	ans := 0
	fmt.Scan(&n)
	sc := bufio.NewScanner(os.Stdin)
	vs := strToInt(readLine(sc))
	cs := strToInt(readLine(sc))
	for i := 0; i < n; i++ {
		if vs[i]-cs[i] > 0 {
			ans += (vs[i] - cs[i])
		}
	}
	fmt.Println(ans)
}