#import<bits/stdc++.h>
int n,r,i,ii,j,x;main(){std::cin>>n;for(;i<=n;r+= ii!=1 ==4-x,ii=i++,x=0)for(j=1;++j*j<n;){if(!(ii%j)){ii/=j;x++;}x=ii%j?x:5;}printf("%d\n",r);}