#include<iostream>

using namespace std;

int main(void)
{       
    int i=1,s=0,n;
    cin>>n;
    while(i<=n){
        if(i%3==2&&i%5==3&&i%7==2)s+=1;
        i++;
        
    }
    cout<<s;
    return 0;
}

/**************************************************************
	Problem: 1055
	User: LYY001
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/