n = int(input())
preans = []
if n % 2 == 0:
    x = int(n/2)
    ans_list = [1] * x
    #リストの数字を結合
    ans = int("".join(map(str, ans_list)))
else:
    if n == 1:
        ans = 0
        pass
    else:
        x = int(n/2)
        y = int(n%2)
        ans_list = [7] + [1] * (x-1)
        ans = int("".join(map(str, ans_list)))

print(ans)