#include <stdio.h>

int r[86402]={},u,i,n,t;g(s,o){for(;s<86401;n<r[s]?n=r[s]:0,++s)r[s+o]+=o?-1:1;}main(){for(n=0;scanf("%d%d%d",&u,&t,&i)==3;g(t,i));printf("%d",n);}