import sys


N = int(input())
a = 0
if N % 2 == 0:#偶数
    if N == 0: a = 0
    if N >= 2: a = N / 2
else:
    if N == 1: a = 0
    if N >= 3:
        N -= 3
        a = N / 2
        sys.stdout.write('7')

for i in range (int(a)):
    sys.stdout.write('1')
print()