#import<bits/stdc++.h>
using namespace std;int m,n,l,c,d;
main(){cin>>m;for(;l<=m;l++){d=0;n=l;for(int i=2;i<=n;i++){if(n%i==0){n/=i,d++;if(n%i==0)d=0,i=n+1;}}c+=d==4;}cout<<c<<'\n';}