using System;
using System.Linq;
 
class ReturnValueAttribute : Attribute
{
	public object val { get; set; }
	public ReturnValueAttribute(object v) {val = v; }
}
 
public class Test
{
	public static void Main()
	{
		// your code goes here
		int i = foo();
		Console.WriteLine(i);
	}
 
	[ReturnValue(100)]
	public static int foo()
	{
		var rtn = typeof(Test).GetMethod("foo")
			.GetCustomAttributes(typeof(ReturnValueAttribute), false).FirstOrDefault();
		return (int)((ReturnValueAttribute)rtn).val;
	}
}

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