#include <iostream>
using namespace std;

int sum(int n){
	int s = 0;
	while(n != 0){
		s = s + n % 10;
		n = n / 10;
	}
	return s;
}

int main(){
	int n,c = 0;
	cin>>n;
	for(int i = 1;i <= n;i++){
		if(sum(i) == 13){
			c++;
		}
	}
	cout<<c<<endl;
}


/**************************************************************
	Problem: 1511
	User: admin
	Language: C++
	Result: Accepted
	Time:138 ms
	Memory:2072 kb
****************************************************************/