n = int(input())
ans = [[i,j] for i in range(1,9) for j in range(2,10) if i < j]
if n % 36 == 0:
  syou = n//36
else:
  syou = n//36 +1
amari = n%36
print(str(ans[amari-1][0]) + str(ans[amari-1][1])*(syou))