UVA - 11526 - H(n) (Java Solution)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuffer sb = new StringBuffer("");
        int cases=Integer.parseInt(br.readLine());
        for(int i=0;i<cases;i++){
            int x=Integer.parseInt(br.readLine());
            sb.append(H(x)).append("\n");
        }
        System.out.print(sb);
    }
   
static long H(int x){
    if (x<1)
        return 0;
    long sum = 0;
    int sqr = (int) (Math.sqrt(x));
    for (int i = 1, end = x; i < sqr + 1; i++) {
        int temp = x / i;
        sum += temp + (end - temp) * (i - 1);
        end = temp;
    }
    if (x / sqr > sqr) {
        sum += sqr;
    }
    return sum;
    }
}