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)

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

int main(void){
    int N;
    int tmp;
    int tmp2;
    int ni;
    int i,j,k;
    int count =0;
    int f[10002];

    scanf("%d", &N);
    for (ni=1; ni<=N; ni++) {
        //tmp = (int)sqrt((double)ni/6.0)+5;
        tmp = (int)sqrt(ni-2) + 1;
        for (i=1; i<=tmp; i++) {
            for (j=1; j<=tmp; j++) {
                for (k=1; k<=tmp; k++) {
                    tmp2 = i*i + j*j + k*k + i*j + j*k + k*i;
                    if (tmp2==ni){
                        count = count +1;
                    }
                }
            }
        }
        f[ni] = count;
        count = 0;


    }

    for (i=1; i<=N; i++) {
        printf("%d\n", f[i]);
    }

    

    return 0;
}