#include<bits/stdc++.h>
using namespace std;
int ss(int n){
	int s=0;
	for(int i=1;i<=n-1;i++){
		if(n%i==0){
			s+=i;
		}
	}
	return s;
}
int main()
{
	int n,i,s=0;
	cin>>n;
	for(i=1;i<=n;i++){
		if(ss(i)==i){
			s++;
		}
	}
	cout<<s;
	return 0;
}

/**************************************************************
	Problem: 1150
	User: zzz
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/