#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <map>
#include <string>
#include <vector>
#include <set>
#include <algorithm>
using namespace std;
int a[10001];
int main()
{
	int t,n,s1,s2,j,e1,e2,num,i;
	scanf("%d",&t);
	while(t--)
	{
		scanf("%d",&n);
		memset(a,0,sizeof(a));
	int mi = 0;
		for(i = 0;i<n;i++)
		{
			scanf("%d %d:%d %d:%d",&num,&s1,&s2,&e1,&e2);
			for(j = s1*60+s2;j<e1*60+e2;j++)
			{
				a[j] += num;
				if(a[j]>mi) mi = a[j];
			}
			      
		}
	
		printf("%d\n",mi);
	}
	return 0;
}