import math

nyuuryoku = input()

match = int(nyuuryoku)
digit = math.floor(match/2)

result = int(0)
i = int(0)

while match > 1:
    result += 10**i
    i += 1
    match -= 2
    
if match == 1:
    result += 6*10**(i-1)

print(result)