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Buy 2 Get 1 Free Solution 

Codechef March Lunchtime 2022

Problem Code : SALE2

Problem Link : https://www.codechef.com/LTIME106B/problems/SALE2

Solution :

#include <bits/stdc++.h>

#define ll long long int

#define ull unsigned long long int

using namespace std;

void solve()

{

    ll n, x;

    cin >> n >> x;

    cout << ((n / 3) * 2 * x) + (n % 3) * x << "\n";

}

int main()

{

    ll t;

    cin >> t;

    while (t--)

    {

        solve();

    }

}