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)

fn input_vec<T: std::str::FromStr>()->Vec<T>{
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	s.trim().split_whitespace().map(|e| e.parse().ok().unwrap()).collect()
}
fn main() {
	let input = input_vec::<i64>();
	let l = input[0];
	let r = input[1];
	let d = input[2];
	let result = (r-r%d)/d-(l-1-(l-1)%d)/d;
	println!("{}",result);


    
}