#include<stdio.h>
 
using namespace std;
int i,j,k,n,o,p[500100],a,b,q;
char v[500100];
int constr(int o)
{
	for(int i=2;i<=o;i++)
    {
        if(!v[i])
        {
            p[i]=p[i-1]+1;
            for(int j=i+i;j<=o;j+=i)
            {
                v[j]=1;
            }
        }
        else
        {
            p[i]=p[i-1];
        }
    }
}
void afis()
{
	printf("%d\n",p[b]-p[a-1]);
}
int main()
{
    freopen("densitate.in","r",stdin);
    freopen("densitate.out","w",stdout);
    scanf("%d%d",&n,&q);
    constr(n);
    for(i=1;i<=q;i++)
    {
        scanf("%d%d",&a,&b);
		afis();
    }
    return 0;
}