Problem:
Rectangle

Write a program which calculates the area and perimeter of a given rectangle.

Input

The length a and breadth b of the rectangle are given in a line separated by a single space.

Output

Print the area and perimeter of the rectangle in a line. The two integers should be separated by a single space.

Constraints

1 ≤ a, b ≤ 100

Sample Input 1

3 5

Sample Output 1

15 16

Solution in JAVA (judge verdict: Accepted)

import static java.lang.System.out;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.List;
import java.util.Arrays;
import java.util.stream.Collectors;

class Main {
  public static void main(String...args) throws Exception {
    BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));

    List<Integer> list = stdin.lines()
      .flatMap(
        v -> Arrays.asList(v.split(" ")).stream())
      .mapToInt(Integer::parseInt)
      .boxed()
      .collect(Collectors.toList());

    int area = list.stream()
      .mapToInt(Integer::intValue)
      .reduce(1, (a,b) -> a * b );

    int perimeter = list.stream()
      .mapToInt(Integer::intValue)
      .sum() * 2;

    out.printf("%d %d\n", area, perimeter);

  }
}