total_num = int(input())

num_for_1 = 2
num_for_7 = 3

answer = ""
if total_num % 2 == 0:
    for i in range(total_num // num_for_1):
        answer += "1"
else:
    answer = "7"
    for i in range((total_num - num_for_7) // num_for_1):
        answer += "1"

print(int(answer))