n = int(input())

answer = []

if n%2 == 0:
    for i in range(int(n/2)):
        answer.append(1)
else:
    answer.append(7)
    for i in range(int(n/2) - 1):
        answer.append(1)

sorted_answer = sorted(answer, reverse=True)
maped_sorted_answer = map(str, sorted_answer)
res = ''.join(maped_sorted_answer)

print(int(res))