ans = ""
N = int(input())
if N % 2 == 0:
    n = N / 2
    ans = "1" * int(n)
    print(ans)
else:
    if N == 3:
        ans = "7"
    else:
        n = (N - 3) / 2
        ans = "7"
        ans += "1" * int(n)
    print(ans)