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: Time Limit Exceeded)

#include <stdio.h>

int main (){
	int L, R, d, ctr = 0;
	
	scanf ("%d %d %d", &L, &R, &d);
	
	while (L <= R){
		if (L % d == 0){
			ctr = ctr + 1;
		}else if (R % d == 0){
			ctr = ctr + 1;
		}
		L++;
		R++;
	}
	
	printf ("%d", ctr);
	return 0;
}