#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: zhuanghaoxiang
	Language: C++
	Result: Accepted
	Time:107 ms
	Memory:2072 kb
****************************************************************/