Coderforces George and Accommodation

http://codeforces.com/problemset/problem/467/A

import java.util.Scanner;public class George_and_Accommodation {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);int n = scanner.nextInt();int count = 0;for(int i = 0; i < n; i++) {int p = scanner.nextInt();int q = scanner.nextInt();if((q-p) >= 2) count++;}System.out.println(count);}}