# -*- coding: UTF-8 -*-.  #!/bin/python 
import sys 
import os 
import math
length = 1 
s='' 
_N = int(raw_input()) 
for i in range(2,10000000):
    n = range(1,i) 
    if len(n)>0:  
        for k in range(len(n)):
            s +=str(n[k])
        last_length = length
        length = s.__len__() 
    if _N in range(last_length,length): 
        print s[_N-1] 
        break