网易第二题为啥就AC30%,求助

public class NetEase2018Spring_1 {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        int k = scanner.nextInt();
        int sum = 0;
        for (int y = k + 1; y <= n; y++) {
            sum = sum + (y - k) * (n / y);//y-k表示一轮有多少个x可以匹配，例如y=4，k=2时，n=10，x能匹配的就是2,3,2+4,3+4,2+4+4
            if (n % y != 0 && k + y * (n / y) <= n) {
                sum = sum + n - (k + y * (n / y)) + 1;
            }
        }     }
}