source_code: import java.util.*;
  import java.io.*;
   
  public class Main {
  	public static void main(String args[]) {new Main().run();}
  	
  	Scanner in = new Scanner(System.in);
  	PrintWriter out = new PrintWriter(System.out);
  	void run(){
  	    work();
  	    out.flush();
  	}
  	void work() {
  	    long r=in.nextLong();
  	    long b=0;
  	    for(;;b++){
  	        long num=9*(long)Math.pow(10,(double)b)*(b+1);
  	        if(r-num<=0){
  	            break;
  	        }
  	        r-=num;
  	    }
  	    long base=(long)Math.pow(10,(double)b);
  	    long c=(r-1)/(b+1);
  	    int m=(int)((r-1)%(b+1));
  	    base+=c;
  	    
  	    String str=base+"";
  	    out.println(str.charAt(m));
  	}
  }