#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
#include <iomanip>
#include<cmath>
#include<queue>
#include <functional>

using namespace std;
typedef long long ll;

long long MOD=998244353;

//yukicoder No.526

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