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 C (GCC 9.2.1) (judge verdict: Accepted)

#include<stdio.h>
#include<math.h>
#include <limits.h>
#include<stdlib.h>


int main() {
	int l,r,d,a;
	int count = 0;
	scanf("%d", &l);
	scanf("%d", &r);
	scanf("%d", &d);

	a = d;
	while (a <= 100) {
		if (a >= l && a <= r) {
			count++;
		}
		a += d;
	}
	printf("%d\n", count);
	return 0;
}