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: Wrong Answer)

//
//  main.c
//  Number of Multiples
//
//  Created by k19031kk on 2020/07/11.
//  Copyright © 2020 AIT. All rights reserved.
//

#include <stdio.h>

int main(int argc, const char * argv[]) {
    int minnum,maxnum,num;
    int sub;
    scanf("%d",&num);
    scanf("%d",&minnum);
    scanf("%d",&maxnum);
    
    sub = maxnum - minnum;
    num = sub / num;
    printf("%d\n",num);
    return 0;
}