# Maximize big when both big and small can be exchanged

• Difficulty Level : Easy
• Last Updated : 11 May, 2021

Given N Big Candies and M Small Candies. One Big Candy can be bought by paying X small candies. Alternatively, one big candy can be sold for Y small candies. The task is to find the maximum number of big candies that can be bought.
Examples:

Input: N = 3, M = 10, X = 4, Y = 2
Output:
8 small candies are exchanged for 2 big candies.
Input: N = 3, M = 10, X = 1, Y = 2
Output: 16
Sell all the initial big candies to get 6 small candies.
Now 16 small candies can be exchanged for 16 big candies.

In first example, Big candies cannot be sold for profit. So, only the remaining small candies can be exchanged for big candies.
In second example, Big candies can be sold for profit.
Approach: If initial big candies can be sold for profit i.e. X < Y then sell the big candies and update the count of small and big candies. Then, sell all of the updated small candies in order to buy big candies.
Below is the implementation of the above approach:

## C++

 `// C++ implementation of the approach``#include ``using` `namespace` `std;` `    ``// Function to return the maximum big``    ``// candies that can be bought``    ``int` `max_candies(``int` `bigCandies,``        ``int` `smallCandies,``int` `X, ``int` `Y)``    ``{``        ``// If initial big candies``        ``// can be sold for profit``        ``if` `(X < Y)``        ``{``            ``smallCandies += Y * bigCandies;``            ``bigCandies = 0;``        ``}` `        ``// Update big candies that can be bought``        ``bigCandies += (smallCandies / X);` `        ``return` `bigCandies;``    ``}` `    ``// Driver code``    ``int` `main()``    ``{``        ``int` `N = 3, M = 10;``        ``int` `X = 4, Y = 2;``        ``cout << (max_candies(N, M, X, Y));``        ``return` `0;``    ``}`

## Java

 `// Java implementation of the approach``class` `GFG {` `    ``// Function to return the maximum big candies``    ``// that can be bought``    ``static` `int` `max_candies(``int` `bigCandies, ``int` `smallCandies,``                           ``int` `X, ``int` `Y)``    ``{``        ``// If initial big candies can be sold for profit``        ``if` `(X < Y) {` `            ``smallCandies += Y * bigCandies;``            ``bigCandies = ``0``;``        ``}` `        ``// Update big candies that can be bought``        ``bigCandies += (smallCandies / X);` `        ``return` `bigCandies;``    ``}` `    ``// Driver code``    ``public` `static` `void` `main(String[] args)``    ``{``        ``int` `N = ``3``, M = ``10``;``        ``int` `X = ``4``, Y = ``2``;` `        ``System.out.println(max_candies(N, M, X, Y));``    ``}``}`

## Python3

 `# Python3 implementation of the approach` `# Function to return the maximum big candies``# that can be bought``def` `max_candies(bigCandies, smallCandies, X, Y):``    ` `    ``# If initial big candies can``    ``# be sold for profit``    ``if``(X < Y):``    ` `        ``smallCandies ``+``=` `Y ``*` `bigCandies``        ``bigCandies ``=` `0``    ` `    ``# Update big candies that can be bought``    ``bigCandies ``+``=` `(smallCandies ``/``/` `X)` `    ``return` `bigCandies` `# Driver code``N ``=` `3``M ``=` `10``X ``=` `4``Y ``=` `2``print``(max_candies(N, M, X, Y))` `# This code is contributed by Code_Mech`

## C#

 `// C# implementation of the approach``using` `System;` `class` `GFG``{``    ` `    ``// Function to return the maximum``    ``// big candies that can be bought``    ``static` `int` `max_candies(``int` `bigCandies,``                        ``int` `smallCandies,``                        ``int` `X, ``int` `Y)``    ``{``        ``// If initial big candies``        ``// can be sold for profit``        ``if` `(X < Y)``        ``{``            ``smallCandies += Y * bigCandies;``            ``bigCandies = 0;``        ``}` `        ``// Update big candies that can be bought``        ``bigCandies += (smallCandies / X);` `        ``return` `bigCandies;``    ``}` `    ``// Driver code``    ``static` `public` `void` `Main ()``    ``{``        ``int` `N = 3, M = 10;``        ``int` `X = 4, Y = 2;``        ``Console.WriteLine(max_candies(N, M, X, Y));``    ``}``}` `// This Code is contributed by ajit...`

## PHP

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## Javascript

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Output:
`5`

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