fzu 2138

#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<cmath>
#include<algorithm>
#include<cstdlib>
#include<queue>
#include<vector>
#include<set>
using namespace std;
int t,n,a[5],sum,res;
int main()
{
      scanf("%d",&t);
      while(t--)
      {
            sum=0;
            scanf("%d",&n);
            for(int i=0;i<5;i++)
            {
                 scanf("%d",&a[i]);
                 sum+=a[i];
            }
            res=sum-2*n;
            if(res<0)
                  printf("0\n");
            else
            {
                  if(res%3==0)
                        res=res/3;
                  else
                        res=res/3+1;
                  printf("%d\n",res);
            }
      }
      return 0;
}