#include <bits/stdc++.h>
using namespace std;
long long n,a,b,ans=0;
int x[50001];
void sieve(int N) {
for(int i=0;i<=N;++i)x[i]=1;
x[0]=0;
x[1]=0;
for(int i=2;i*i<=N;++i)
if(x[i]==1) for(int j=i*i;j<=N;j+=i)x[j]=0;
}
int main()
{
freopen("BEAUNUM.inp","r",stdin);
freopen("BEAUNUM.out","w",stdout);
sieve(35000);
cin>>n;
for(int i=1;i<=(int)sqrt(sqrt(n));i++)ans+=x[i];
cout<<ans;
}
Replies to BEAUNUM 
| Title |
Name |
Language |
UNIX |
When |
| COUNTNUM |
Lê Hải Đăng |
cpp |
1711011271 |
1 Month ago. |
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