n = 500
S = []
t = 2
for i in range(2, 10):
    S += [i] * t
    t *= 2
n = int(input())
t = 0
A = [0] * n
for i in range(n):
    if i & 1:
        A[i] = S[t]
        t += 1
    else:
        A[i] = 1
print(*A, sep="")