#!/bin/ruby

n,x,y = gets.strip.split(' ')
n = n.to_i
x = x.to_i
y = y.to_i

sum = 0
for a0 in (0..n-1)
    latitude,longitude,height,points = gets.strip.split(' ')
    latitude = latitude.to_i
    longitude = longitude.to_i
    height = height.to_i
    points = points.to_i
    
    
    sum +=points
end
puts sum