#import"bits/stdc++.h"
int n,i=1,j,l[1<<22];main(){for(std::cin>>n;++i<n;)if(!l[i])for(j=i;j<=n;j+=i)l[j]+=j/i%i>0?:5;printf("%d\n",std::count(l,l-~n,4));}