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>

int n;
std::vector<int> v,c;



int main()
{
    std::cin >> n;
    v.resize(n);
    c.resize(n);
    for(int i = 0; i < n; i++)std::cin >> v[i];
    for(int i = 0; i < n; i++)std::cin >> c[i];
    int res = 0;

    for(int bit = 0; bit < (1 << n); bit++){
        int V = 0, C = 0;
        for(int i = 0; i < n; i++){
            if(bit & (1 << i)){
                V += v[i];
                C += c[i];
            }
        }
        res = std::max(V - C, res);
    }
    std::cout << res << std::endl;

}