using System;

public class Test
{
	public static void Main()
	{
		int ans = 0;
		for (var dt = new DateTime(2015, 1, 1); dt.Year == 2015; dt = dt.AddDays(1))
		{
			if (dt.Day / 10 + dt.Day % 10 == dt.Month)
			{
				++ans;
			}
		}
		Console.WriteLine(ans);
	}
}