N = int(input())
s = N //36
#print(s)
t = N%36
#print(t)
count = 0
for i in range(1,9):
  if count + 9-i < t:
    count += 9-i
  else:
    a = i
    b = t-count+i
    break
print(str(a)+str(b)*(s+1))