#import<bits/stdc++.h>
int n,r,i,ii,j,x;main(){for(std::cin>>n;i<=n;r+= ii!=1 ==5-x,ii=++i,x=1)for(j=1;x&&++j*j<n;x=ii%j?x:0)if(!(ii%j)){ii/=j;x++;}printf("%d\n",r);}