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 <bits/stdc++.h>
using namespace std;
int main(){
 long long N;
 cin>>N;
 for(long long f=1; f<N+1; f++){
     long long count=0;
     for(long long x=1; x<33; x++){
         for(long long y=1; y<33; y++){
             for(long long z=1; z<33; z++){
                 if(f==x*x+y*y+z*z+x*y+x*z+z*y)
                     count++;
                 
             }
         }
     }
     cout<<count<<endl;
 }
}