#include <bits/stdc++.h>
using namespace std;
long long n;
int a[40000];
int main()
{
freopen("beaunum.inp","r",stdin);
freopen("beaunum.out","w",stdout);
cin>>n;
long k=sqrt(sqrt(n));
for(long i=2;i<=k;i++)
a[i]=1;
a[1]=0;
for(long i=2;i<=k;i++)
if(a[i]==1)
for(long j=2;j<=k/i;j++)
a[i*j]=0;
long d=0;
for(long i=1;i<=k;i++)
if(a[i]==1) d++;
cout<<d;
return 0;
}
Replies to Beaunum 
| Title |
Name |
Language |
UNIX |
When |
| Cloprime |
Nguyen Ly Gia Bao |
cpp |
1711012429 |
1 Month ago. |
{"html5":"htmlmixed","css":"css","javascript":"javascript","php":"php","python":"python","ruby":"ruby","lua":"text\/x-lua","bash":"text\/x-sh","go":"go","c":"text\/x-csrc","cpp":"text\/x-c++src","diff":"diff","latex":"stex","sql":"sql","xml":"xml","apl":"apl","asterisk":"asterisk","c_loadrunner":"text\/x-csrc","c_mac":"text\/x-csrc","coffeescript":"text\/x-coffeescript","csharp":"text\/x-csharp","d":"d","ecmascript":"javascript","erlang":"erlang","groovy":"text\/x-groovy","haskell":"text\/x-haskell","haxe":"text\/x-haxe","html4strict":"htmlmixed","java":"text\/x-java","java5":"text\/x-java","jquery":"javascript","mirc":"mirc","mysql":"sql","ocaml":"text\/x-ocaml","pascal":"text\/x-pascal","perl":"perl","perl6":"perl","plsql":"sql","properties":"text\/x-properties","q":"text\/x-q","scala":"scala","scheme":"text\/x-scheme","tcl":"text\/x-tcl","vb":"text\/x-vb","verilog":"text\/x-verilog","yaml":"text\/x-yaml","z80":"text\/x-z80"}
