# Enter your code here. Read input from STDIN. Print output to STDOUT
[n,x,y]=map(int,raw_input().split(" "))
l=[]
la=[]
lo=[]
he=[]
po=[]
for i in range(n):
    [la1,lo1,he1,po1]=map(int,raw_input().split(" "))
    la.append(la1)
    lo.append(lo1)
    he.append(he1)
    po.append(po1)
LEN=len(he)
for i in range(LEN):
    for j in range(i+1,LEN):
        if he[i]>he[j]:
            temp=he[i]
            he[i]=he[j]
            he[j]=temp
            temp=la[i]
            la[i]=la[j]
            la[j]=temp
            temp=lo[i]
            lo[i]=lo[j]
            lo[j]=temp
            temp=po[i]
            po[i]=po[j]
            po[j]=temp
#print la,lo,he,po
total=0
cou=0
for i in range(LEN-1):
    #print la[i],la[i+1],lo[i],lo[i+1]
    if abs(la[i]-la[i+1])<=x:
        if abs(lo[i]-lo[i+1])<=y:
            total+=po[i]
            if i==LEN-2:
                cou=5
if cou==5:
    total+=po[LEN-1]
if total==0:
    total=max(po)
print total