[백준] 2588번 : 곱셈 - C#

https://www.acmicpc.net/problem/2588

using System;

class Program
{
    static void Main() {
        string s=Console.ReadLine();
        string s1=Console.ReadLine();
        int n=int.Parse(s);
        int m=int.Parse(s1);
        
        int num=m%10;
        int a=num*n;
        m/=10;
        
        num=m%10;
        int b=num*n;
        m/=10;
        
        num=m%10;
        int c=num*n;
        
        int sum=(a+b*10+c*100);
        Console.WriteLine(a);
        Console.WriteLine(b);
        Console.WriteLine(c);
        Console.WriteLine(sum);
    }
}