f=open("vaipsis.txt")
k, l, p=[int(s) for s in f.readline().strip().split(" ")]
hoidla=set()
  
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):
      hoidla.add(str(rida)+"_"+str(veerg))

print(len(hoidla))