Solution.java

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

public class Solution {

  // Complete the workbook function below.
  static int workbook(int n, int k, int[] arr) {
    int counter = 0;
    int page = 1;
    for (int i = 0; i < arr.length; i++) {
      for (int j = 1; j <= arr[i]; j = j + k) {
        int current = k;
        if (j + k - 1 > arr[i]) {
          current = arr[i] % k;
        }
        if (j <= page && page < j + current) {
          counter++;
        }
        page++;
      }
    }

    return counter;
  }

  private static final Scanner scanner = new Scanner(System.in);

  public static void main(String[] args) throws IOException {
    BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

    String[] nk = scanner.nextLine().split(" ");

    int n = Integer.parseInt(nk[0]);

    int k = Integer.parseInt(nk[1]);

    int[] arr = new int[n];

    String[] arrItems = scanner.nextLine().split(" ");
    scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");

    for (int i = 0; i < n; i++) {
      int arrItem = Integer.parseInt(arrItems[i]);
      arr[i] = arrItem;
    }

    int result = workbook(n, k, arr);

    bufferedWriter.write(String.valueOf(result));
    bufferedWriter.newLine();

    bufferedWriter.close();

    scanner.close();
  }
}