#include <iostream>
using namespace std;

int main(){
	using ll = int64_t;
	ll n, m;
	cin >> n >> m;
	ll a[n + 1];
	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;
}