#include<iostream>
#include<cstdio>
using namespace std;
inline int read(){
int x=0,f=1;char ch=getchar();
while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
return x*f;
}
int n,r,mx,my,ans,f[5005][5005];
int main(){
n=read();r=read();
for(int i=1;i<=n;i++){
int x=read(),y=read(),v=read();
f[x+1][y+1]=v;
mx=max(x+1,mx);my=max(y+1,my);
}
mx=min(mx+r,5001);my=min(my+r,5001);
......
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