数学思路：乘法的定义为多个加法，当包含1的时候，乘法才小于加法。

import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        if(a == 1 || b == 1){
            System.out.println((a + b) * c);
        }else if(c == 1){
            System.out.println(a * (b + c));
        }else{
            System.out.println(a * b * c);
        }
    }
}