#include <iostream>
using namespace std;
typedef long long ll;
ll n,m;
ll fib(ll n){
    if(n==1)return 0;
    if(n==2)return 1;
    return (fib(n-1)+fib(n-2))%m;
}
int main(void){
    cin>>n>>m;
    cout<<fib(n)<<endl;
}