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 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <limits.h>
#include <string.h>

int main(void) {
   int W,H,x,y;
 scanf("%d %d %d %d",&W,&H,&x,&y);
 long double res=0;
 int count =0;
 long double test = (long double)W/2;
 if ((long double)x==((long double)W/2)) {res=H*((long double)W/2);
                        count++;
                        }
   else {res=(W*H)/2;
   count++;}

  if ((long double)y==((long double)H/2)) {res=W*((long double)H/2);
                        count++;
                       }
     else {res=W*H/2;
     count++;}
if (count==2) printf("%Lf 1",res);
else if (count<2) printf("%Lf 0",res);
 return EXIT_SUCCESS;
}