#include <iostream>
#include <fstream>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
long long a, n;
pair <long long, long long> euclid(long long x, long long y)
{
    if(y==0)
    return {1, 0};
    auto p=euclid(x, x%y);
    return {p.second, p.first-(x/y)*p.second};
}

int main()
{
    f>>a>>n;
    long long rez=euclid(a, n).first;
    while(rez<0)
        rez+=n;
    rez=rez%n;
    g<<rez;
    return 0;
}