#include<iostream>
#include<math.h>
#include<string.h>
#include<vector>
#include<algorithm>
#include<iomanip>
#include<deque>
using namespace std;

int main(){
	unsigned long long n,m;
	cin >> n >> m;
	vector<unsigned long long> a(n);
	for(long long i=0;i<n;i++){
		if(i==0){
			a[i]=0;
		}else if(i==1){
			a[i]=1;
		}else{
			a[i]=(a[i-1]+a[i-2])%m;
		}
	}
	unsigned long long ans=a[n-1];
	cout << ans << endl;
	return 0;
}