백준 2959 거북이

https://www.acmicpc.net/problem/2959

2959번: 거북이

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());
        int[] arr = new int[4];
        for (int i = 0; i < 4; i++) {
            arr[i] = Integer.parseInt(st.nextToken());
        }
        Arrays.sort(arr);
        System.out.println(arr[arr.length - 2] * arr[0]);
    }
}