#include<bits/stdc++.h>
using namespace std;
int yinzihe(int n){
    int s=0;
    for(int i=1;i<=n-1;i++){
        if(n%i==0){
            s+=i;
        }
    }
    return s;
}
int main(){
    int v,cnt=0;
    cin>>v;
    for(int i=1;i<=v;i++){
        if(i==yinzihe(i)){
            cnt++;
        }
    }
    cout<<cnt;
    return 0;
}
/**************************************************************
	Problem: 1150
	User: luyanchen
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/