#include <bits/stdc++.h>
using namespace std;
int sum(int n){//求数字和
	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++){//1~n范围内
		if(sum(i) == 13){//数字和等于13
			c++;//符合的个数
		}
	}
	cout<<c<<endl;
}