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

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0); 
	
	long long n, m;
	cin >> n >> m;
	vector<long long> a(n);
	a[0] = 0;
	a[1] = 1;
	for(int i = 2; i < n; i++) {
		a[i] = a[i - 1] + a[i - 2];
		a[i] %= m;
	}
	cout << a[n - 1] << endl;
	return 0;
}