using System;

class Program01 {
		static void csinal1(int a) {			
			a = 1;
		}
		static void csinal2(ref int a) {			
			a = 2;
		}
		static void csinal3(out int a) {			
			a = 3;
		}
		static void Main() {
			int b = 0;

			csinal1(b);
			Console.WriteLine(b);
			csinal2(ref b);
			Console.WriteLine(b);
			csinal3(out b);
			Console.WriteLine(b);			
		}
}