#include<iostream>
#include<cstdio>
using namespace std;
long long t,n,num;
unsigned long long ans;
int main(){
    scanf("%d",&t);
    for(int i=1;i<=t;i++)
    {
        ans=0;
        scanf("%d",&n);
        ans=(1+n)*n/2-1;
        printf("%lld\n",ans);
    }
}