#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,i,j,a,h=0,b;
	cin>>n;
	for(i=1;i<=n;i++){
		b=0;
		j=i;
		while(j>0){
			a=a%10;
			j=j/10;
			b=b+a;
		}
		if(b==10){
			h++;
		}
	}
	cout<<h;
}
/**************************************************************
	Problem: 1985
	User: linzihang
	Language: C++
	Result: Wrong Answer
****************************************************************/