n = int(input())
one2 = n // 8
m = n % 8
sev = 0
one = 0
if m >= 6:
    one += 3
    m -= 6
elif m == 5:
    sev += 1
    one += 1
elif m == 4:
    one2 += 1
elif m == 3:
    sev += 1
elif m == 2:
    one += 1

print(sev * "7" + one2 * "1" * 2 + one * "1")