//多次输入，需要素数筛和前缀和
//#include<bits/stdc++.h>
#include<algorithm>
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cassert>
#include <cstdio>
#include <vector>
#include <string>
#include <cmath>
#include <queue>
#include <stack>
#include <set>
#include <map>
using namespace std;
#define P(a,b,c) make_pair(a,make_pair(b,c))
#define rep(i,a,n) for (int i=a;i<=n;i++)
#define per(i,a,n) for (int i=n;i>=a;i--)
#define CLR(vis) memset(vis,0,sizeof(vis))
#define MST(vis,pos) memset(vis,pos,sizeof(vis))
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
#define SZ(x) ((int)(x).size())
typedef pair<int,pair<int,int> >pii;
typedef long long ll;
typedef unsigned long long ull;
const ll mod = 1000000007;
const int INF = 0x3f3f3f3f;
ll gcd(ll a, ll b) {
return b ? gcd(b, a%b) : a;
}
template <class T>
inline bool scan_d(T &ret) {
char c;
int sgn;
if(c=getchar(),c==EOF) return 0; //EOF
while(c!='?'&&(c<'0'||c>'9')) c=getchar();
sgn=(c=='?')?-1:1;
ret=(c=='?')?0:(c-'0');
while(c=getchar(),c>='0'&&c<='9') ret=ret*10+(c-'0');
ret*=sgn;
return 1;
}
inline void outt(int x) {
if(x>9) outt(x/10);
putchar(x%10+'0');
}
template<class T>inline void gmax(T &A, T B){
(A<B)&&(A=B);//if(B>A)A=B;
}
template<class T>inline void gmin(T &A, T B){
(A>B)&&(A=B);//if(B<A)A=B;
}
const int maxn=4e6+10;
int a[maxn];
int vis[maxn];
int cnt[maxn];
void prim(){
vis[0]=1;
vis[1]=1;
rep(i,2,4000000){
if(!vis[i]){
for(int j=i*2;j<=4000000;j+=i){
if(!vis[j])vis[j]=1;
}
}
}
}
int main(){
int t;
cin>>t;
prim();
rep(i,1,1000000){
if(!vis[i*3+7])cnt[i]=cnt[i-1]+1;
else cnt[i]=cnt[i-1];
}
while(t--){
int n;
scanf("%d", &n);
printf("%d\n", cnt[n]);
}
return 0;
}
撰写