#import"bits/stdc++.h"
using namespace std;main(){int n,i=2,j;cin>>n;vector<int>l(n+1);for(;i<n;i++)if(!l[i])for(j=i;j<=n;j+=i)l[j]+=5*(j/i%i==0)+1;cout<<count(l.begin(),l.end(),4)<<endl;}