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

long long int f[5000001];

int main(void)
{
	cin.tie(0);
	ios::sync_with_stdio(false);

	long long int n,m;

	cin >> n >> m;

	f[1] = 0;
	f[2] = 1;

	for(int i=3;i<=n;i++)
	{
		f[i] = f[i-1] + f[i-2];
		f[i]%=m;
	}

	cout << f[n] << '\n';
	
	return 0;
}