#include <iostream>
using namespace std;
typedef long long ll;

int main(){
  ll N,M;
  cin >> N >> M;
  ll a = 0;
  ll b = 1;
  ll c;
  for(ll i=3; i <= N;i++){
      c = (a+b) % M;
      a = b;
      b = c;
  }
  cout << c % M << endl;
  return 0;
}