#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

ll N, M;
ll Fib[5050505];

int main() {
  cin >> N >> M;
  Fib[1] = 0;
  Fib[2] = 1;
  for (ll i = 3; i <= N; i++) {
    Fib[i] = (Fib[i - 1] + Fib[i - 2]) % M;
  }
  cout << Fib[N] << endl;
  return 0;
}