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>
int func(int n);
int main(void){

    int N;
    scanf("%d",&N);

    for(int i=1;i<=N;i++){ 
        printf("%d\n",func(i));
    }

    return 0;
}
int func(int n){
    int count=0;
    for(int i=1;i*i<=n;i++){
        for(int j=1;j*j<=n;j++){
            for(int k=1; k*k<=n;k++){
                //printf("%d %d %d \n",i,j,k);
                if(i*i+j*j+k*k+i*j+j*k+k*i==n){count++;}
            }
        }
    }
    return count;
}