#include <iostream>
#include <fstream>

using namespace std;

long long a,n,rez;

long long indicator()
{
    rez=n;
    if(n%2==0)
    {
        while(n%2==0)
            n/=2;
        rez/=2;
    }
    for(long long i=3;i*i<=n;i+=2)
        if(n%i==0)
        {
            rez=rez/i*(i-1);
            while(n%i==0)
                n/=i;
        }
    if(n!=1)
        rez=rez/n*(n-1);
}

void putere()
{
    ofstream fout("inversmodular.out");
    long long sol=1;
    while(rez)
    {
        if(rez%2)
        {
            rez--;
            sol=(sol*a)%n;
        }
        else
        {
            rez/=2;
            a=(a*a)%n;
        }
    }
    fout<<sol;
}

int main()
{
    ifstream fin("inversmodular.in");
    fin>>a>>n;
    indicator();
    rez--;
    putere();
    return 0;
}