题解

#include<bits/stdc++.h>
using namespace std;
int main(){
long int a;
cin>>a;
if(a1||a%21){//没有最大值和最小值//
cout<<0<<" "<<0;
}
else{
cout<<ceil(1.0*a/4)<<" "<<a/2;//
向上取整//
}
}