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 JavaScript (node.js v5.12) (judge verdict: Time Limit Exceeded)

"use strict";
    
const main = arg => {
  let Nums = arg.split(" ");
  let Min = Nums[0]*1;
  let Max = Nums[1]*1;
  let div1 = Nums[2]*1;
  let div2 = Nums[3]*1;
  let ans = 0;

  for(let i = Min; i <= Max; i++){
  	if((i % div1 !== 0) && (i % div2 !== 0)){
    	ans++;
    }
  }
  
  console.log(ans);
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));