#include <iostream>
#include <algorithm>
using namespace std;
int compare(int a,int b)
{
return a > b;
}
int main() {
// your code goes here
int t, n;
cin >> t >> n;
int a[160],b[160];
while(t--)
{
int score_sum[160] = {0},foul_sum[160] = {0};
for(int i = 0;i < n;i++)
{
cin >> a[i];
score_sum[i] += a[i] * 20;
}
for(int i = 0;i < n;i++)
{
cin >> b[i];
foul_sum[i] += b[i] * 10;
}
int net_sum[n] = {0};
for(int i = 0;i < n;i++)
{
net_sum[i] = score_sum[i] - foul_sum[i];
if(net_sum[i] <= 0)
net_sum[i] = 0;
}
sort(net_sum, net_sum + n,compare);
cout << net_sum[0] << endl;
}
return 0;
}
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