using System;
using System.Collections;
using System.Linq;

class Program
{
	static void Main()
	{
		int[] xs = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToArray();
		Console.WriteLine(((xs[0] % xs[3]) * (xs[1] % xs[3]) * (xs[2] % xs[3])) % xs[3]);
	}
}