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 proconio::{input,fastout};

#[fastout]
fn main() {
  input!{l:i32, r:i32, d:i32,};
  let mut i = 0;
  let mut cnt = 0;
  loop{
    if l <= i && r >= i {
      cnt += 1;
    }
    if r < i {
      break;
    }
    i += d;
  }
  println!("{}",cnt);
}