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>
#define rep(i,l,m) for(int i=l;i<=(int)(m);i++)

int main(){
  int L,R,d,count=0;

  scanf("%d",&L);
  scanf("%d",&R);
  scanf("%d",&d);

  rep(i,L,R){
    if(i%d==0)count++;
  }
  printf("%d\n",count);

  return 0;
}