```cpp
#include <iostream>
using namespace std;
int prime(int n) {
if(n<2) return 0;
for(int i=2;i*i<=n;i++)
if(n%i==0)
return 0;
return 1;
}
int main() {
int n,m;
cin>>n>>m;
while(n--) {
int l,r,num=0;
cin>>l>>r;
if(l<1 || r>m) {
cout<<"Crossing the line"<<endl;
continue;
}
for(int i=l;i<=r;i++)
if(prime(i))
num++;
cout<<num<<endl;
}
return 0;
}
```
by Ryanwu_AK_CSP @ 2023-07-19 14:00:32