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

class Solution
{
    static Dictionary<ulong, ulong> memo = new Dictionary<ulong, ulong>();

    static ulong GetFib(ulong n, ulong m)
    {
        if (n == 1)
        {
            return 0;
        }

        if (n == 2)
        {
            return 1 % m;
        }

        if (memo.ContainsKey(n))
        {
            return memo[n];
        }

        var fib = (GetFib(n - 1, m) + GetFib(n - 2, m)) % m;
        memo[n] = fib;
        return fib;
    }

    static void Main()
    {
        var vals = Console.ReadLine().Split(' ').Select(ulong.Parse).ToArray();
        var n = vals[0];
        var m = vals[1];

        Console.WriteLine(GetFib(n, m));
    }
}