import java.util.Scanner;
public class Main{
  public static void main(String[] argas){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int count = 0;
    if(a / 100 == 1) count++;
    if(a / 10  % 2  == 1) count++;
    if ( a % 2 == 1) count++;
    System.out.println(count);
  }
} import java.util.Scanner; Scanner java.util public class Main{
  public static void main(String[] argas){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int count = 0;
    if(a / 100 == 1) count++;
    if(a / 10  % 2  == 1) count++;
    if ( a % 2 == 1) count++;
    System.out.println(count);
  }
} Main public static void main(String[] argas){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int count = 0;
    if(a / 100 == 1) count++;
    if(a / 10  % 2  == 1) count++;
    if ( a % 2 == 1) count++;
    System.out.println(count);
  } main {
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int count = 0;
    if(a / 100 == 1) count++;
    if(a / 10  % 2  == 1) count++;
    if ( a % 2 == 1) count++;
    System.out.println(count);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int count = 0; count 0 if(a / 100 == 1) count++; a / 100 == 1 a / 100 a 100 1 count++ count if(a / 10  % 2  == 1) count++; a / 10  % 2  == 1 a / 10  % 2 a / 10 a 10 2 1 count++ count if ( a % 2 == 1) count++; a % 2 == 1 a % 2 a 2 1 count++ count System.out.println(count) System.out.println System.out System System.out count String[] argas argas public class Main{
  public static void main(String[] argas){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int count = 0;
    if(a / 100 == 1) count++;
    if(a / 10  % 2  == 1) count++;
    if ( a % 2 == 1) count++;
    System.out.println(count);
  }
} public class Main{
  public static void main(String[] argas){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int count = 0;
    if(a / 100 == 1) count++;
    if(a / 10  % 2  == 1) count++;
    if ( a % 2 == 1) count++;
    System.out.println(count);
  }
} Main
import java.util.Scanner;
public class Main{
  public static void main(String[] argas){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int count = 0;
    if(a / 100 == 1) count++;
    if(a / 10  % 2  == 1) count++;
    if ( a % 2 == 1) count++;
    System.out.println(count);
  }
}