#include<bits/stdc++.h>

using namespace std;

typedef long long int64;

int64 N, M;
int64 dp[5000001];

int64 f(int k)
{
  if(k <= 2) return (k - 1);
  if(~dp[k]) return (dp[k]);
  return (dp[k] = (f(k - 1) + f(k - 2)) % M);
}

int main()
{

  cin >> N >> M;
  memset(dp, -1, sizeof(dp));
  for(int i = 2; i <= 5000000; i++) f(i);
  cout << f(N) << endl;
}