Problem:
Score : 100 points

Problem Statement

How many multiples of d are there among the integers between L and R (inclusive)?

Constraints

All values in input are integers.

1 \leq L \leq R \leq 100

1 \leq d \leq 100

Input

Input is given from Standard Input in the following format:

L R d

Output

Print the number of multiples of d among the integers between L and R (inclusive).

Sample Input 1

5 10 2

Sample Output 1

3

Among the integers between 5 and 10, there are three multiples of 2: 6, 8, and 10.

Sample Input 2

6 20 7

Sample Output 2

2

Among the integers between 6 and 20, there are two multiples of 7: 7 and 14.

Sample Input 3

1 100 1

Sample Output 3

100

Solution in Java (OpenJDK 11.0.6) (judge verdict: Accepted)

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// AISing_A
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int L = sc.nextInt();
		int R = sc.nextInt();
		int d = sc.nextInt();

		int res = 0;

		for(int i = L; i <= R; i++) {
			if(i%d == 0) {
				res++;
			}
		}
		// 出力
		System.out.println(res);
	    // Scannerクラスのインスタンスをクローズ
		sc.close();
	}
}