public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int t = in.nextInt();
        for(int a0 = 0; a0 < t; a0++){
            int n = in.nextInt()-1;
            //code below:
						
            long ans=(3*sum(n/3))+(5*sum(n/5))-(15*sum(n/15));
            System.out.println(ans);
            
            //code above:
            
        }
    }
    
    public static long sum(long num){
        return (num*(num+1))/2;
    }
}