import java.util.Scanner;
class Solution
{
	public static void main(String[]args)
	{
		Scanner s=new Scanner(System.in);
		int t=s.nextInt();
		while(t-->0)
		{
			int x=s.nextInt();
			int y=s.nextInt();
			int z=s.nextInt();
			if(x<=3)
			{
				System.out.print(x*y);
			}
			else if(x%3==0)
			{
				int result=(x*y)+((x/3-1)*z);
				System.out.print(result);
			}
			else
			{
				int temp=(x*y)+((x/3)*z);
				System.out.print(temp);
			}
		    System.out.println();
		}
	}
}

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NAoyIDEyIDEwCjMgMTIgMTAKNyAyMCA4CjI0IDQ1IDE1Cg==

4
2 12 10
3 12 10
7 20 8
24 45 15