#include<bits/stdc++.h>
using namespace std;
#define R(i,a,b)for(int i=a;i<=b;i++)
int main(){int N,M=3500000,a=0,c,t;vector<int>d(M+1);R(i,2,M)if(d[i]<1)R(j,1,M/i)d[i*j]=i;cin>>N;R(i,1,N){t=i;c=0;set<int>s;while(t>1){s.insert(d[t]);t/=d[t];c++;}a+=c==4&&s.size()==4;}cout<<a<<endl;}