UVA10071

公式

$2\ast v\ast t$

程式

package OneStar;  
  
import java.util.Scanner;  
  
public class UVA10071 {  
    public static void main(String[] args) {  
        Scanner sc = new Scanner(System.in);  
        while(sc.hasNext()){  
            int v = sc.nextInt();  
            int t = sc.nextInt();  
            System.out.println(2*v*t);  
        }  
    }  
}