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- package com.company;
- import java.io.BufferedReader;
- import java.io.IOException;
- import java.io.InputStreamReader;
- public class Main {
- public static void main(String[] args) throws IOException {
- BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
- int[] arr = new int[100];
- for (int i = 0; i < arr.length; i++) {
- if (i == 0) {
- i = i + 1;
- if (i % 2 == 0) {
- arr[i] = i;
- }
- else {
- arr[i] = i;
- }
- }
- if (i % 2 == 0) {
- arr[i] = i;
- }
- else {
- arr[i] = i;
- }
- }
- int A = Integer.parseInt(reader.readLine());
- int B = Integer.parseInt(reader.readLine());
- System.out.println(((arr[A] - arr[B]) / 2) * (-1));
- }
- }
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