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 Rust (1.42.0) (judge verdict: Accepted)

use std::io;
use std::io::{stdin, Read};
use std::process::exit;

fn main() {
    let mut input_line: String = String::new();
    stdin().read_line(&mut input_line).expect("Err");
    let inputs: Vec<&str> = input_line.split_whitespace().collect();

    let r:i32 = inputs[1].to_string().parse().unwrap();
    let mut l:i32 = inputs[0].to_string().parse().unwrap();
    let d:i32 = inputs[2].to_string().parse().unwrap();

    let mut ans = 0;

    while l!=(r+1){
        if l % d == 0{
            ans += 1;
        }
        l += 1;
    }

    println!("{}", ans);

}