## Table of Contents

**Chef and the Hair Salon Solution Codechef**

Chef recently realized that he needs a haircut, and went to his favorite hair salon. At the salon, he found N customers waiting for their haircuts. From his past experience, Chef knows that the salon takes M minutes per customer. Only one person can get their haircut at a time.

For how many minutes will Chef have to wait before he can get his haircut?

**Input Format**

- The first line of input contains a single integer T, denoting the number of test cases. The description of T test cases follows.
- The first and only line of each test case contains two space-separated integers N and M, as described in the problem.

**Output Format**

For each test case, print a single line containing one integer the number of minutes that Chef will have to wait before he can get his haircut.

**Constraints**

- 1≤T≤1000
- 0≤N≤1000
- 1≤M≤1000

**Subtasks**

**Subtask #1 (100 points):** Original constraints

**Sample Input 1**

```
2
2 15
0 15
```

**Sample Output 1**

```
30
0
```

### Explanation

**Test case 1**: There are 2 customers waiting for the haircut and the salon will take 15 minutes for each customer, hence Chef will have to wait for 30 minutes before he can get his haircut.

**Test case 2**: There are 0 customers waiting for the haircut, therefore the Chef will not have wait to get the haircut.

**SOLUTION**

** Program: **Chef and the Hair Salon Solution in Python

```
for _ in range(int(input())):
a,b=map(int,input().split())
if a>0:
print(a*b)
else:
print(a)
```

*Program: **Chef and the Hair Salon Solution* in C++

```
#include <bits/stdc++.h>
using namespace std;
int main() {
int t;
cin>>t;
while(t--)
{
int n,m;
cin>>n>>m;
cout<<(n*m)<<endl;
}
return 0;
}
```

** Program: Chef and the Hair Salon Solution** in Java

```
import java.util.*;
import java.lang.*;
import java.io.*;
class Codechef
{
public static void main (String[] args) throws java.lang.Exception
{
Scanner sc= new Scanner(System.in);
int t=sc.nextInt();
for(int i=0;i<t;i++)
{
int a=sc.nextInt();
int b=sc.nextInt();
if (a!=0)
{
System.out.println(a*b);
}
else{
System.out.println(a);
}
}
}
}
```

*February Long Challenge 2022 Solution*

*February Long Challenge 2022 Solution*