Problem:
Score : 100 points

Problem Statement

We have a sandglass that runs for X seconds. The sand drops from the upper bulb at a rate of 1 gram per second. That is, the upper bulb initially contains X grams of sand.

How many grams of sand will the upper bulb contains after t seconds?

Constraints

1≤X≤10^9

1≤t≤10^9

X and t are integers.

Input

The input is given from Standard Input in the following format:

X t

Output

Print the number of sand in the upper bulb after t second.

Sample Input 1

100 17

Sample Output 1

83

17 out of the initial 100 grams of sand will be consumed, resulting in 83 grams.

Sample Input 2

48 58

Sample Output 2

0

All 48 grams of sand will be gone, resulting in 0 grams.

Sample Input 3

1000000000 1000000000

Sample Output 3

0

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)


import java.util.Scanner;

public class Main{


	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);

		int n = scan.nextInt();
		scan.nextLine();

		int[] array = new int[n];
		int max = 0;
		for (int i = 0; i < n; i++) {
			array[i] = scan.nextInt();
			if (array[i] > max) {
				max = array[i];
			}
		}
		int[] result = new int[100003];
		int ans = 0;
		for (int i = 0; i < n; i++) {
			result[array[i]+1]++;
			result[array[i]]++;
			result[array[i] + 2]++;

		}
		max = 0;
		for (int i = 0; i < 100003; i++) {
			if (result[i] > max) {
				max = result[i];
			}
		}
		System.out.println(max);

	}

}