why UNK?

#include<iostream>
using namespace std;
void work(int n){
    cout<<n*(n-1)*(n-2)*(n-3)/24+n*(n-1)/2+1<<"\n";
}
int main(){
	int T,n;
	cin>>T;
	while(T--) cin>>n,work(n);
    return 0;
}