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