Bitqoins#238
Miss M lives on the planet Bitaqulandia, where the most popular currency is the bitqoin. Recently, Miss M held a mini-competition for friends, where each winner receives exactly three bitqoins.
It is known that in Miss M's competition, the prize fund is bitqoins, people won, and each winner receives exactly three bitqoins.
Determine how many bitqoins will remain with Miss M if she gives three bitqoins to each winner. It is known that Miss M has enough bitqoins.
The first line contains one integer (3 \leq n \leq 100) — the number of bitqoins.
The second line contains one integer (1 \leq m \leq 100) — the number of Miss M's friends who won in the competition.
It is guaranteed that Miss M will have enough bitqoins to distribute to her winning friends.
Print a single integer — the number of bitqoins that will remain with Miss M after she distributes them to the winners.
Example
Miss M had two friends win, she will give three bitqoins to each of them. In total, she will give away six, so only four bitqoins will remain.