n = int(input())
cnt = 0
for i in range(1,n+1):
    if i%3 == 2 and i%5 == 3 and i%7 == 2:
        cnt+=1
print(cnt)

#include<bits/stdc++.h>
#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;
int n,s=0;
int main(){
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        if(i%3==2 and i%5==3 and i%7==2)
        {
            s++;
        }
    }
    
    cout<<s<<endl;
    return 0;
}

C++ :

#include <iostream>
#include <cstdio>
using namespace std;

int main()
{
    int n,num=0;
    scanf("%d",&n);
    bool flag=false;
    for(int i=1; i<=n; i++){
        if(i%3==2 && i%5==3 && i%7==2){
            num++;
            flag=true;
        }
    }
    if(flag){
        printf("%d\n",num);
    }else{
        printf("0\n");
    }
    return 0;
}