#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
int a,n;
int ridicare(int baza,int exp){
    int rez=1;
    while(exp!=0){
        if(exp%2==0){
            baza=baza*baza;
            exp/=2;
        }
        else{
            rez=rez*baza;
            exp--;
        }
    }
    return rez;
}
int main()
{
    fin>>a>>n;
    a=n%a;
    fout<<ridicare(a,n-2)%n-1;
    return 0;
}