1 #include<cstdio>
 2 #include<cstring>
 3 #include<algorithm>
 4 using namespace std;
 5 
 6 int main()
 7 {
 8     //freopen("in.txt","r",stdin);
 9     int sum[1550];
10     int t,m,n,i,j,am,ah,lm,lh,ar,le,ans,num;
11     scanf("%d",&t);
12     while(t--)
13     {
14         memset(sum,0,sizeof(sum));
15         scanf("%d",&n);
16         for(i=0;i<n;i++)
17         {
18             scanf("%d %d:%d %d:%d",&num,&ah,&am,&lh,&lm);
19             int ar=ah*60+am;
20             int le=lh*60+lm-1;
21             for(j=ar;j<=le;j++)
22             sum[j]+=num;
23         }
24         ans=0;
25         for(i=0;i<1550;i++)
26         ans=max(ans,sum[i]);
27         printf("%d\n",ans);
28     }
29     return 0;
30 }