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

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

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