#include <iostream>
 int main(){
   long long int n,m;
   std::cin >> n >> m;
   long long int dp[n];
   dp[0] = 0;
   dp[1] = 1;
   for(long long int i = 2; i < n; i++) dp[i] = (dp[i-1]+dp[i-2])%m;
   std::cout << dp[n-1] << std::endl;
 }