#include<bits/stdc++.h>
using namespace std;
int cs(int n){
	int j=n,i,s=0;
	while(j){
		s+=j%10;
		j/=10;
	}
	return s;
}
int main()
{
	int n,i,s=0;
	cin>>n;
	for(i=1;i<=n;i++){
		if(cs(i)==13){
			s++;
		}
	}
	cout<<s;
	return 0;
}

/**************************************************************
	Problem: 1511
	User: zzz
	Language: C++
	Result: Accepted
	Time:102 ms
	Memory:2072 kb
****************************************************************/