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

long long M;
int N;
long long F[ 5000005 ];

int main( int argc, char *argv[] )
{
int i;

	ios::sync_with_stdio( false );
	cin.tie( 0 );

	F[ 1 ] = 0;
	F[ 2 ] = 1;

	cin >> N;
	cin >> M;
	for( i = 3; i <= N; i++ )
	{
		F[ i ] = F[ i - 1 ] + F[ i - 2 ];
		F[ i ] %= M;
	}

	cout << F[ N ] << endl;

	return 0;
}