#include<bits/stdc++.h>
using namespace std;
int k(long j){
	long h=0;
	for(long i=1;i<=sqrt(j);i++){
		if(j%i==0){
            if(i!=j/i&&i!=1) h+=i+j/i;
            else h+=i;
        }
	}
	return h;
}
int main(){
	long n,g=0;
	cin>>n;
	for(int i=6;i<=n;i++){
		if(k(i)==i) g++;
	}
	cout<<g;
}
/**************************************************************
	Problem: 1150
	User: wangyiyang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/