n = int(raw_input())
t = n
s = ""
while t > 1:
    if t >= 6:
        s = s + "9"
        t = t - 6
    elif t >= 3:
        s = s + "7"
        t = t - 3
    elif t >= 2:
        s = s + "1"
        t = t - 1
print int(s)