N = int(input())
print(2*N-3)
for i in range(N-1):
  print(i,i+1,2*i+1)
for i in range(2,N):
  print(1,i,2*i)
for i in range(N-1):
  for j in range(i+1,N):
    if i == 0:
      print(j,end = " ")
      for k in range(j):
        print(k,end = " ")
      print() 
    else:
      print(j-1,end = " ") 
      for k in range(i-1,0,-1):
        print(k,end = " ")
      print(N-3+i+1,end = " ")
      for k in range(i+1,j):
        print(k,end = " ")  
      print()