def main():
    n = int(input())
    digits = int(n // 2)
    surplus = n % 2

    num_list = [1 for i in range(digits)]
    if surplus == 1:
        num_list[0] = 7
    num = "".join(map(str, num_list))
    print(num)


if __name__ == "__main__":
    main()