n = int(input())

ans = []
while n >= 5:
    print(ans.append('1'))
    n -= 2

if n == 4:
    ans.append('1')
    ans.append('1')
elif n == 3:
    ans.append('7')
elif n == 2:
    ans.append('1')

ans.sort(reverse=1)
print(''.join(ans))