#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    int x;
    int y;
    scanf("%d%d%d",&n,&x,&y);
    int la[n],lo[n],h[n],temp,val[n];
    int i,j;
    for(i=0;i<n;i++)
    {
        scanf("%d%d%d%d",&la[i],&lo[i],&h[i],&val[i]);    
    }
    for(i=0;i<n;i++)
    {
        for(j=i+1;j<n;j++)
        {
            if(h[i]>h[j])
            {
                temp=h[i];
                h[i]=h[j];
                h[j]=temp;
                
                
                temp=val[i];
                val[i]=val[j];
                val[j]=temp;
                
                
                temp=la[i];
                la[i]=la[j];
                la[j]=temp;
                
                
                temp=lo[i];
                lo[i]=lo[j];
                lo[j]=temp;
            }
        }
    }
    int total=val[0];
    for(i=0;i<n-1;i++)
    {
        if((la[i+1]-la[i])<=x && (lo[i+1]-lo[i])<=y)
        {
                total = total + val[i+1];
                
        }
    }
    
    printf("%d",total);
}