#include<bits/stdc++.h>
using namespace std;
int yzh(int a)
{
	int x=0;
	for(int i=1;i<a;i++)
	{
		if(a%i==0)
		{
			x+=i;
		}
	}
	return x;
}
int main()
{
	int n;
	cin>>n;
	int cnt=0;
	for(int i=1;i<=n;i++)
	{
		if(yzh(i)==i)
		{
			cnt++;
		}
	}
	cout<<cnt;
	return 0;
}
/**************************************************************
	Problem: 1150
	User: chenkexin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/