Problem:
Score : 300 points

Problem Statement

You are given four integers A, B, C, and D. Find the number of integers between A and B (inclusive) that can be evenly divided by neither C nor D.

Constraints

1\leq A\leq B\leq 10^{18}

1\leq C,D\leq 10^9

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B C D

Output

Print the number of integers between A and B (inclusive) that can be evenly divided by neither C nor D.

Sample Input 1

4 9 2 3

Sample Output 1

2

5 and 7 satisfy the condition.

Sample Input 2

10 40 6 8

Sample Output 2

23

Sample Input 3

314159265358979323 846264338327950288 419716939 937510582

Sample Output 3

532105071133627368

Solution in C++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main() {
    long min,max,count,a,b;

    cin >> min;
    cin >> max;
    cin >> a;
    cin >> b;
    count = 0;

    for(int j = min; j < max; j++){

        if (a > j ){
            continue;
        }

        if (j % a != 0){
            if (b < j){
                if (j % b != 0) {
                    count += 1;
                }
            }else {
                continue;
            }
        } else {
            continue;
        }
    }

    cout << count << endl;
  
  return 0;
}