https://www.acmicpc.net/problem/11022
using System;
class Program
{
static void Main() {
string s=Console.ReadLine();
int t=int.Parse(s);
for(int i=1;i<=t;i++){
string[] s1=Console.ReadLine().Split(' ');
int a=int.Parse(s1[0]);
int b=int.Parse(s1[1]);
Console.WriteLine("Case #{0}: {1} + {2} = {3}",i,a,b,a+b);
}
}
}