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 Kotlin (1.3.71) (judge verdict: Runtime Error)

import kotlin.math.sqrt
fun main() {
// 文字列
//    val str = readLine()!!
// 数値
    val n = readLine()!!.toInt()
// 行
//    val list = readLine()!!.split(" ").map(String::toInt)
//    val (a,b,c) = readLine()!!.split(" ").map(String::toInt)

//    val (a,b,c)="0 0 0".split(" ").map(String::toInt)

    val m= sqrt(n.toDouble()).toInt()
    for (o in 1..n) {
        var an = 0
        for (i in 1..m) {
            for (j in 1..m) {
                for (k in 1..m) {
                    val sum = i * i + j * j + k * k + i * j + j * k + k * i
                    if (o == sum) {
                        an++
                    }
                }
            }
        }
        println(an)

    }



//    print(str)
}