def function1(n):
  a = 0
  for (i = 0; i < n; i += 1):
    for (j = 0; j < n; j += 1):
      a += 1
  return a

def function2(n):
  a = 0
  for (i = 0; i < n; i += 1):
    a += n
  return a

def function3(n):
  return n * n