n = int(input())
num = 1
num7 = 7
if n % 2 == 0:
    for i in range(n // 2 - 1):
        num = num * 10 + 1
    print(num)
else:
    for i in range(n // 2 - 1):
        num7 = num7 * 10 + 1
    print(num7)