#include <iostream>
using namespace std;
typedef long long ll;
ll n,m,bik[5000001];
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;
    bik[1]=0;
    bik[2]=1;
    for(int i=3;i<=5000000;i++){
        bik[i]=(bik[i-1]+bik[i-2])%m;
    }
    cout<<bik[n]<<endl;
}