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Minimum positive integer value possible of X for given A and B in X = P*A + Q*B
• Last Updated : 30 Apr, 2021

Given values of A and B, find the minimum positive integer value of X that can be achieved in the equation X = P*A + P*B, Here P and Q can be zero or any positive or negative integer.
Examples:

```Input: A = 3
B = 2
Output: 1

Input: A = 2
B = 4
Output: 2```

Basically we need to find P and Q such that P*A > P*B and P*A – P*B is minimum positive integer. This problem can be easily solved by calculating GCD of both numbers.
For example:

```For A = 2
And B = 4
Let P  = 1
And Q = 0
X = P*A + Q*B
= 1*2 + 0*4
= 2 + 0
= 2 (i. e GCD of 2 and 4)

For A = 3
and B = 2
let P = -1
And Q = 2
X = P*A + Q*B
= -1*3 + 2*2
= -3 + 4
= 1 ( i.e GCD of 2 and 3 )```

Below is the implementation of above idea:

## CPP

 `// CPP Program to find``// minimum value of X``// in equation X = P*A + Q*B` `#include ``using` `namespace` `std;` `// Utility function to calculate GCD``int` `gcd(``int` `a, ``int` `b)``{``    ``if` `(a == 0)``        ``return` `b;``    ``return` `gcd(b % a, a);``}` `// Driver Code``int` `main()``{``    ``int` `a = 2;``    ``int` `b = 4;``    ``cout << gcd(a, b);``    ``return` `0;``}`

## Java

 `// Java Program to find``// minimum value of X``// in equation X = P*A + Q*B``import` `java.util.*;``import` `java.lang.*;` `class` `GFG {``    ``// utility function to calculate gcd` `    ``public` `static` `int` `gcd(``int` `a, ``int` `b)``    ``{``        ``if` `(a == ``0``)``            ``return` `b;` `        ``return` `gcd(b % a, a);``    ``}` `    ``// Driver Program``    ``public` `static` `void` `main(String[] args)``    ``{``        ``int` `a = ``2``;``        ``int` `b = ``4``;` `        ``System.out.println(gcd(a, b));``    ``}``}`

## Python3

 `# Python3 Program to find``# minimum value of X``# in equation X = P * A + Q * B` `# Function to return gcd of a and b`  `def` `gcd(a, b):``    ``if` `a ``=``=` `0``:``        ``return` `b``    ``return` `gcd(b ``%` `a, a)`  `a ``=` `2``b ``=` `4``print``(gcd(a, b))`

## C#

 `// CSHARP Program to find``// minimum value of X``// in equation X = P*A + Q*B``using` `System;` `class` `GFG {``    ``// function to get gcd of a and b``    ``public` `static` `int` `gcd(``int` `a, ``int` `b)``    ``{``        ``if` `(a == 0)``            ``return` `b;` `        ``return` `gcd(b % a, a);``    ``}` `    ``// Driver Code``    ``static` `public` `void` `Main()``    ``{``        ``int` `a = 2;``        ``int` `b = 4;``        ``Console.WriteLine(gcd(a, b));``    ``}``}`

## PHP

 `// PHP Program to find``// minimum value of X``// in equation X = P*A + Q*B` ``

## Javascript

 ``

Output

`2`

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