source_code: import java.util.Scanner;
  public class Main
  {
  	public static void main(String[] args) {
  	    Scanner sc =new Scanner(System.in);
  	    long n=sc.nextLong();
  	    long x=1;
  	    long ar=0;
  	    tag:for(long i=1;;i++)
  	    {
  	        ar+=9*i*x;
  	        if(ar>=n)
  	        {
  	            long d = n - (ar-9*i*x);
  	            long ans = x+d/i;
  	            long p=d%i;
  	            if(p==0)
  	            {
  	                p=i;
  	                ans--;
  	            }
  	            p=i-p;
  	            p++;
  	            long fns=0;
  	            //System.out.println(ans);
  	            while(p!=0)
  	            {
  	                fns=ans%10;
  	                ans/=10;
  	                p--;
  	            }
  	            System.out.println(fns);
  	            
  	            break tag;
  	        }
  	        x*=10;
  	    }
  	}
  }
  