Java Tribonacci

package Exams;

import java.util.Scanner;

public class SimpleLoops {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int n = input.nextInt();
        int num1 = input.nextInt();
        int num2 = input.nextInt();
        int num3 = input.nextInt();
        int result = 0;

        if (n == 1) {
            System.out.println(num1);
        }
        else if (n == 2) {
            System.out.println(num2);
        }
        else if (n == 3) {
            System.out.println(num3);
        }
        else {
            for (int i = 4; i <= n; i++) {
                result = num1 + num2 + num3;
                num1 = num2;
                num2 = num3;
                num3 = result;
            }
            System.out.println(num3);
        }
    }

}