#include<iostream>
#include<string>
#include<algorithm>
#include<cmath>
#include<iomanip>
#include<cstring>
#include<map>
#include<vector>
#include<queue>
#include<climits>
using namespace std;
typedef long long int ll;

ll a[5000009];
int main(){

	ll n, m;
	cin >> n >> m;
	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;

  return 0;
}