import java.util.*;
public class Main{
	public static int getS(int n){
		int t,S=0;
		while(n>0){
			t=n%10;
			S+=t;
			n=n/10;
		}
		return S;		
	}


	public static void main(String args[]){
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		int a=0;
		for(int i=1;i<=n;i++){
			if(getS(i)==13)
				a++;
			
		}
		System.out.print(a);
	}
}
/**************************************************************
	Problem: 1511
	User: admin
	Language: Java
	Result: Accepted
	Time:812 ms
	Memory:40160 kb
****************************************************************/