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

unsigned long long n,m;

vector<vector<unsigned long long>> a = {{1,1},{1,0}};

vector<vector<unsigned long long>> mul(vector<vector<unsigned long long>> const &b,vector<vector<unsigned long long>> const &c){
  vector<vector<unsigned long long>> d(2,vector<unsigned long long>(2,0));
  for(int i=0;i<2;i++)
    for(int j=0;j<2;j++)
      for(int k=0;k<2;k++){
	d[i][k] += b[i][j] * c[j][k] % m;
	d[i][k] %= m;
      }
  return d;
}

vector<vector<unsigned long long>>  rep_mul(vector<vector<unsigned long long>> const &b,unsigned long long i){
  if(i==1) return b;
  if(i%2==1){
    vector<vector<unsigned long long>> temp = b;
    return mul(rep_mul(mul(b,b),i/2),temp);
  }else{
    return rep_mul(mul(b,b),i/2);
  }
}

int main(){

  cin >> n >> m;
  auto ans = rep_mul(a,n-2);
  
  cout << ans[0][0] << endl;
  
}