using System;

public class Test
{
	public static void Main()
	{
		bool fine = true;
		for (int i = -5 ; i != 6 ; i++) {
			for (int j = -5 ; j != 6 ; j++) {
				ulong c = Combine(i, j);
				int iBack, jBack;
				Decombine(c, out iBack, out jBack);
				if (i != iBack || j != jBack) {
					fine = false;
					Console.WriteLine("{0}/{1} {2}/{3}", i, iBack, j, jBack);
				}
			}
		}
		if (fine) {
			Console.WriteLine("OK");
		}
	}
	private static ulong Combine(int a, int b) {
		uint ua = (uint)a;
		ulong ub = (uint)b;
		return ub <<32 | ua;
	}
	private static void Decombine(ulong c, out int a, out int b) {
		a = (int)(c & 0xFFFFFFFFUL);
		b = (int)(c >> 32);
	}
}