#include<iostream>
#include<algorithm>
#include<string>
#include<math.h>
#include<bitset>
#include <vector>
#include<bitset>
#include <iomanip>
#include <map>
#include <set>
#include <stack>
#include <deque>
#include <climits>
#include <queue>
using namespace std;

int main() {
	
	long long N, M;
	cin >> N >> M;
	long long A[350000];
	A[1] = 0;
	A[2] = 1;
	for (int i = 3; i <= N; i++) {
		A[i] = (A[i - 1] + A[i - 2]) % M;
	}
	cout << A[N] << endl;

}