//#define LOCAL

#include <fstream>
#include <iostream>
#include <cmath>
#include <algorithm>
#include <vector>
#include <map>
#include <queue>
#include <cstring>
#include <climits>
#include <set>

//#define int long long
//typedef long long ll;
using ll = long long;
using R = double;

//#define rep(i,n) for(int i=0; i<(n); i++)
#define FOR(i,bg,ed) for(ll i=(bg);i<(ed);i++)
#define REP(i,n) FOR(i,0,n)

#define MOD 1000000007

using namespace std;

typedef vector<int> V;
typedef vector<V> VV;


ll F[5000010];

signed main()
{
#ifdef LOCAL
    ifstream in("input.txt");
    cin.rdbuf(in.rdbuf());
#endif

    ll N, M;

    cin >> N >> M;
    F[1] = 0;
    F[2] = 1;
    for (int i=3; i<=N; i++) {
        F[i] = F[i-1] + F[i-2];
        F[i] %= M;
    }

    cout << F[N] << endl;

    return 0;
}