//侥幸AC了

#include <stdio.h>  

#include <math.h>  

#include <stdlib.h>  

int Get(int n){

int x;

int lo = 1, start = 1, end = 9;

double p10 = 10.0;

while (1){

int temp = (start + end) * 9 * pow(p10, lo - 1) / 2;

if (temp > n)  break;

n -= temp;

lo++;

start = end + lo;

end = start + lo*pow(p10, lo - 1) * 9;

}

while (1){

if (start >= n) break;

n -= start;

start += lo;

}

start = 9;

lo = 1;

while (1){

if (start > n) break;

n -= start;

lo++;

start = 9 * pow(p10, lo - 1)*lo;

}

start = 9 * pow(p10, lo - 2)*(lo-1) + n / lo;

stringstream str;

str<<start;

x = str[n%lo] - '0';

return x;

}

int main()

{

int n;

scanf("%d", &n);

int r = Get(n);

printf("%d\n", r);

}