> #include <stdio.h>
> void main(){
> 	int room[201];
> 	int h,i,j,k,l;
> 	int low,high,testcase,s,t,max;
> 	scanf("%d",&testcase);
> 	for(h=1;h<=testcase;h++){
> 		for(i=1;i<=200;i++)room[i]=0;
> 		scanf("%d",&j);
> 		for(i=1;i<=j;i++){
> 			scanf("%d %d",&s,&t);
> 			low=(s<t)?s:t;
> 			high=(s>t)?s:t;
> 			for(k=low;k<=high;k++){
> 				room[k]++;
> 			}
> 			if(low%2==0)room[low-1]++;
> 			if(high%2==1&&high!=200)room[high+1]++;
> 		}
> 		max=room[1];
> 		for(l=1;l<=200;l++){
> 			max=(room[l]>max)?room[l]:max;
> 		}
> 		printf("%d\n",10*max);
> 	}
> }