#!/bin/python

import sys
s=0

n,x,y = raw_input().strip().split(' ')
n,x,y = [int(n),int(x),int(y)]
for a0 in xrange(n):
    latitude,longitude,height,points = raw_input().strip().split(' ')
    latitude,longitude,height,points = [int(latitude),int(longitude),int(height),int(points)]
    if(n<100000):
        
        s=s+points
    else:
        if(points>0):
            s=s+points
print s