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 Go (1.14.1) (judge verdict: Accepted)

package main

import (
	"fmt"
)

func solve(l, r, d int) int {
	answer := 0

	for i := l; i <= r; i++ {
		if i%d == 0 {
			answer++
		}
	}

	return answer
}

func scanNums(len int) (nums []int) {
	var num int
	for i := 0; i < len; i++ {
		fmt.Scan(&num)
		nums = append(nums, num)
	}
	return
}

func main() {
	nums := scanNums(3)
	l := nums[0]
	r := nums[1]
	d := nums[2]

	result := solve(l, r, d)
	fmt.Println(result)
}