matches = [ 6, 2, 5, 5, 4, 5, 6, 3, 7, 6 ]

def main():
  n = int(input())
  if n == 3:
    ones = 0
    sev = True
  elif n % 2 == 1:
    ones = (n - 3) // 2
    sev = True
  else:
    ones = n // 2
    sev = False
  print(int(("7" if sev else "") +  "1" * ones))

main()