Wylie Coyote is trying to calculate how many hours it takes the Crescent School robotics team to build their robot. Team 610 (Crescent's robotics team) builds a robot in a six-week period between January and February, with each week numbered from ~1 \dots 6~. During this time, they have a very rigorous schedule, and they work different hours on weekends and weekdays.

Since there's no pressure, they only begin working on weekends after week ~W~, after which they will work ~H~ hours each weekend. Apart from the weekend, they work ~N~ hours every week.

Your task is to write a program that calculates how many hours it takes for them to build their robot, which is completed on week 6.

Input Specification

The input will consist of ~2~ or ~3~ positive integers.

The first line will contain the single integer ~N~. The second line will contain the week ~W~ on which Team 610 begins working weekends, inclusive ~(0 \le W \le 6)~. If ~W = 0~, Team 610 does not work weekends. If ~W > 0~, the third line of input will contain the integer ~H~.

Output Specification

The output should be: It takes X hours for Team 610 build a robot., where ~X~ is the number of hours they worked.

Sample Input

2
3
2

Sample Output

It takes 20 hours for Team 610 build a robot.

Explanation

They work 2 hours each week for weeks 1 and 2. Then, they work 2 hours a week and 2 hours per weekend for weeks 3, 4, 5 and 6. In total, they work 20 hours.