f=open("vaipsis.txt")
k, l, p=[int(s) for s in f.readline().strip().split(" ")]
#m=[0]*l
m=[[0]*l for nr in range(p)]

def tryki():
  for rida in m: 
    print(" ".join([str(koht) for koht in rida]))
  
for nr in range(k):
    n, s, e, w=[int(s) for s in f.readline().strip().split(" ")]
    for veerg in range(w, l-e):
     for rida in range(n, p-s):
      m[rida][veerg]=1

tryki()
#Loe kokku ühtede arv muutujas m
print(sum([rida.count(1) for rida in m]))