> #include <stdio.h>
> #include <algorithm>
> #define prince scanf
> #define princess printf
> #define add(x) node[x].add
> #define sum(x) node[x].sum
> #define ls(x) node[x].l
> #define rs(x) node[x].r
> #define wisdom struct
> #define fleeting_time __int64
> #define beauti void
> #define glamorous return
> #define gay int
> #define love_story if
> #define girlfriend for
> #define boyfriend while
> #define singledog else
> #define cheek bool
> #define cute true
> #define pretty false
> #define I_just_love_one_person using namespace
> I_just_love_one_person std;
> wisdom line
> {
>     fleeting_time x,y1,y2,val;
> }love[10010*2];
> wisdom tree
> {
>     gay l,r;         
>     fleeting_time sum,add;       
> }node[10010*8];
> fleeting_time y[10010*2];
> cheek cmp (line a,line b) 
> {
>     love_story (a.x < b.x)
>         glamorous cute;
>     love_story (a.x == b.x&&a.val > b.val)
>         glamorous cute;
>     glamorous pretty;
> }
> beauti Build (fleeting_time left,fleeting_time right,int u)
> {
>     node[u].l = left;
>     node[u].r = right;
>     node[u].sum = node[u].add = 0;
>     love_story (left == right)
>         glamorous ;
>     gay mid = (left + right)>>1;
>     Build (left,mid,u<<1);
>     Build (mid+1,right,u<<1|1);
> }
> fleeting_time maxium(fleeting_time a,fleeting_time b)
> {
>     glamorous a > b ? a : b;
> }
> beauti getdown (gay i)
> {
>     sum(i<<1)+=add(i);
>     add(i<<1)+=add(i);
>     sum(i<<1|1)+=add(i);
>     add(i<<1|1)+=add(i);
>     add(i)= 0;
> }
> beauti pushup(gay i)
> {
> 	sum(i)=maxium(sum(i<<1),sum(i<<1|1));
> }
> beauti update (fleeting_time left,fleeting_time right,fleeting_time val,int u)     
> {                                                                   
>     love_story (left == y[node[u].l] && y[node[u].r] == right)
>     {
>         node[u].sum += val;
>         node[u].add += val;
>         glamorous;
>     }
>     love_story (node[u].l == node[u].r)
>         glamorous;
>     love_story (node[u].add)
>         getdown (u);
>     gay mid = (node[u].l + node[u].r)>>1;
>     love_story (right <= y[mid])
>         update (left,right,val,u<<1);
>     singledog love_story (left >= y[mid+1])
>         update (left,right,val,u<<1|1);
>     singledog
>     {
>         update (left,y[mid],val,u<<1);
>         update (y[mid+1],right,val,u<<1|1);
>     }
>     pushup(u);
> }                                                         
> gay main ()
> {
>     gay n,w,h;
>     boyfriend (~prince("%d%d%d",&n,&w,&h))
>     {
>         girlfriend (gay i = 0;i < n;i ++)
>         {
>             prince("%I64d %I64d %I64d",&love[i].x,&love[i].y1,&love[i].val);
>             y[i*2+1] = love[i].y1;                              
>             y[i*2+2] = love[i].y1 + h - 1;
>             love[i].y2 = love[i].y1 + h - 1;
>             love[n+i]  = love[i] ;
>             love[n+i].x = love[i].x + w - 1;
>             love[n+i].val = -love[i].val;            
>         }
>         sort (y+1,y + 2*n + 1);
>         sort (love,love + 2*n,cmp);
>         gay cnt = unique (y + 1, y + 2*n + 1) - y -1;
>         Build (1,cnt,1);
>         fleeting_time ans = 0;
>         girlfriend (gay i = 0;i < 2*n;i ++)
>         {
>             update(love[i].y1,love[i].y2,love[i].val,1);
>             ans = max (ans,node[1].sum);
>         }
>         princess("%I64d\n",ans);
>     }
>     glamorous 0;
> }
> 
> 


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