Кирилл Деменев

package com.company;

import java.util.Scanner;

public class Main {

    static double everything(double x) {

        if (-2 <= x && x <= 2) {
            x = x * x;
        } else if (x > 2) {
            x = 0;
        } else if (x < -2) {
            x = 4 * (Math.cos(x));
        }
        return x;
    }

        public static void main (String[]args){

            Scanner in = new Scanner(System.in);

            double x = in.nextInt();

            System.out.println(everything(x));
        }
}