# n = [int(input()) for i in range(1)]
n = int(input())

lose = 0
cur = n
answer = []

while cur > 1:
    if cur == 2:
        answer.append(1)
        lose = 2
    elif cur == 3:
        answer.append(7)
        lose = 3
    elif cur == 4:
        answer.append(1)
        answer.append(1)
        lose = 4
    elif cur == 5 or cur == 6:
        answer.append(1)
        answer.append(7)
        lose = 5
    elif cur >= 7:
        answer.append(4)
        answer.append(7)
        lose = 7
    
    cur = cur - lose
    
sorted_answer = sorted(answer)

maped_sorted_answer = map(str, sorted_answer)
res = ''.join(maped_sorted_answer)

print(int(res))