#include <bits/stdc++.h>

using namespace std;
using ll = long long;
int main() {
  int N, M; cin >> N >> M;

  vector<ll> fib(N);
  fib[0] = 0;
  fib[1] = 1;
  for (int i = 2; i < N; ++i) {
    fib[i] = (fib[i-1] + fib[i - 2]) % M;
  }

  cout << fib[N-1] << endl;
  return 0;
}