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)

#[allow(unused_imports)]
use proconio::{input, fastout};
#[allow(unused_imports)]
use proconio::marker::{Chars};

#[fastout]
fn main() {
  input!{
    l:usize,r:usize,d:usize
  }
  let mut i = 1;
  let mut res = 0;
  loop {
    if d*i >= l {
      if d*i <= r {
        i += 1;
        res += 1;
      } else {
        println!("{}",res);
        return;
      }
    } else {
      i += 1;
    }
  }
}