import java.util.*;
public class Main{
	public static void main(String args[]){
    	Scanner scan = new Scanner(System.in);
      	int num = scan.nextInt();
      	int cnt = 0;
        boolean a = num > 99;
      	if(a){
          	cnt++;
        	num = num - 100;
        }
      	boolean b = num > 9;
	    if(b){
      		num = num - 10;
        	cnt++;
      	}
      	boolean c = num == 1;
      	if(c){ cnt ++;}
        System.out.println(cnt);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz