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 (Clang 10.0.0) (judge verdict: Accepted)

#include <stdio.h>

int main(int argc, const char * argv[]) {
    // insert code here...
    int i, n = 0;
    int L, R, d;
    //printf("数値を入力してね\n");
    scanf("%d%d%d", &L, &R, &d);
    /*
    scanf("%d", &L);
    scanf("%d", &R);
    scanf("%d", &d);
     */
    //printf("%d %d %d\n", L, R, d);
    for(i = L;i<=R;i++){
        if(i%d==0){
            //printf("%d\n", i);
            n++;
        }
    }
    printf("%d\n", n);
    return 0;
}