#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define sz(x) int(x.size())
using namespace std;
typedef long long ll;
typedef pair<int, int> P;

const ll INF = 1LL << 60;
ll N, M;
ll dp[5000010];

int main() {
    cin >> N >> M;
    dp[0] = 0;
    dp[1] = 1;

    for (int i = 2; i <= N - 1; i++) {
        dp[i] = dp[i - 1] + dp[i - 2];
        dp[i] %= M;
    }
    cout << dp[N - 1] << endl;
}