n = int(input())
numbers = []

if n % 2 == 0:
  count = n // 2
  for i in range(1, count + 1):
    numbers.append(1)
elif n == 3:
  numbers.append(7)
else:
  count = n // 2
  for i in range(1, count):
    numbers.append(1)
  numbers.append(7)

numbers.sort(reverse=True)
print(*numbers , sep='')