#!/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):
    l1,l2,h,p=map(int,raw_input().split())
    if(n>99999):
        if(p>0):
            s=s+p
    else:
        s=s+p
print s