46 lines
816 B
C++
46 lines
816 B
C++
#include<iostream>
|
|
#include<string.h>
|
|
#include<cstdio>
|
|
using namespace std;
|
|
#define LL long long
|
|
#define M 3100300
|
|
int tag[M],p[M];
|
|
void Prime()
|
|
{
|
|
memset(tag,0,sizeof(tag));
|
|
memset(p,0,sizeof(p));
|
|
int cnt=0,i,j;
|
|
for( i=2;i<M;i++)
|
|
{
|
|
if(!tag[i])
|
|
p[cnt++]=i;
|
|
for( j=0;j<cnt&&p[j]*i<M;j++)
|
|
{
|
|
tag[i*p[j]]=1;
|
|
if(i%p[j]==0)
|
|
break;
|
|
}
|
|
}
|
|
memset(p,0,sizeof(p));
|
|
for( i=1;i<M/3;i++)
|
|
{
|
|
LL t=3*i+7;
|
|
if(tag[t]==0)
|
|
p[i]=p[i-1]+1;
|
|
else
|
|
p[i]=p[i-1];
|
|
}
|
|
}
|
|
int main()
|
|
{
|
|
int n,t;
|
|
Prime();
|
|
scanf("%d",&t);
|
|
while(t--)
|
|
{
|
|
scanf("%d",&n);
|
|
printf("%d\n",p[n]);
|
|
}
|
|
return 0;
|
|
}
|