N = int(input())
str_lst = []

nine = N // 6
seven = (N - nine * 6) // 3
one = (N - nine * 6 - seven * 3) // 2

for i in range(nine):
  str_lst.append('9')
for i in range(seven):
  str_lst.append('7')
for i in range(one):
  str_lst.append('1')

string = ''.join(str_lst)
result = int(string)

print(result)