#include<bits/stdc++.h>
using namespace std;
const int a=1e6+5;
bool isprime[a+1];
void sieve()
{
bool isprime[a+1];
for(int i=0;i<=a;i++) isprime[i]=true;
isprime[0]=false;
isprime[1]=false;
for(int i=2;i*i<=a;i++)
{
if(isprime[i]=true)
{
for(int j=i*i;j<=a;j+=i)
isprime[i]=false;
}
}
}
int main()
{
freopen("beaunum.inp","r",stdin);
freopen("beaunum.out","w",stdout);
long long n,m,d=0;
cin>>n;
m=(int)pow(n,1/4.);
sieve();
for (int i=2;i<=m;i++)
if(isprime[i]=true) d++;
cout<<d;
}
Replies to Beaunum 
| Title |
Name |
Language |
UNIX |
When |
| Beaunum |
Nguyễn Hữu Trần Bảo |
cpp |
1711012402 |
1 Year ago. |
| Cloprime |
Nguyễn Hữu Trần Bảo |
cpp |
1711011584 |
1 Year ago. |
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