f=open("vaipsis.txt", encoding="utf-8")
K, L, P=[int(jupp) for jupp in f.readline().strip().split(" ")]
m=[[0]*L for nr in range(P)]
for nr in range(K):
  N, S, E, W =[int(jupp) 
       for jupp in f.readline().strip().split(" ")]
#  print((L-E-W)*(P-N-S))
  for veerg in range(W, L-E):
    for rida in range(N, P-S):
      m[rida][veerg]=1
#print( "\n".join([" ".join([str(lahter) for lahter in rida])
#           for rida in m]))
#for rida in m: print(*[str(lahter) for lahter in rida])

#Lugege kokku ühtede arv massiivis
print(sum([sum(rida) for rida in m]))
#Katsetage, kui suure alaga suudab programm veel
#mõne sekundi jooksul vastuse arvutada