My solution

Program.cs

@@ -2,6 +2,15 @@
 
 class Program {
 	static void Main(string[] args) {
-		// Your code goes here
+		const int a = 2, b = 3;
+		Console.WriteLine(a + b);
+		Console.WriteLine(a - b);
+		Console.WriteLine(a * b);
+
+		const string s1 = "foo", s2 = "bar";
+		Console.WriteLine(s1);
+		Console.WriteLine(s2);
+		Console.WriteLine(s1 + s2);
+		Console.WriteLine(s2 + s1);
 	}
 }