from itertools import combinations


def Next(): return input()
def NextInt(): return int(Next())
def NextInts(): return map(int,input().split())
def Nexts(): return map(str,input().split())
def NextIntList(): return list(map(int,input().split()))
def RowInts(n): return [int(input()) for i in range(n)]

s = "1212"
for i in range(3, 10):
    for j in range(2**(i-1)):
        s += str(i)
N = int(input())
print(s[:N])