#include<bits/stdc++.h>
using namespace std;

int main(){
    long long N,M;
    map<long long,long long> mp;
    cin >> N >> M;

    mp[0]=0;
    mp[1]=1;

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

    return 0;
}