打表太长，洛谷显示代码过长怎么办

#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
int p[i]={1~1000000的所有素数};
int main()
{
	register int i,n,ans=0;
	cin>>n;
	i=0;
	while(p[i]<=n)
	{
		ans++;
		i++;
	}
	cout<<ans<<endl;
	return 0;
}