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 C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include"bits/stdc++.h"
using namespace std;
#define int long long
#define rep(i,n) for(int i=0;i<n;i++)
#define mkp(a,b) make_pair(a,b)
const long long mod = 1000000007;
const long long inf = 1ll<<61;
typedef pair<int, int> P;
typedef pair<int ,P> PP;
struct edge { int to; int to2; int cost; };
int v[25], c[25];
signed main() {
	int n; cin >> n;
	rep(i, n)cin >> v[i];
	rep(i, n)cin >> c[i];
	int sum = 0;
	rep(i, n) {
		if (v[i] - c[i] >= 0)sum += v[i] - c[i];
	}
	cout << sum << endl;
}