#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
);}
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