#include <bits/stdc++.h>
#include <cstdio>

using namespace std;

pair < long long, long long > euclid_extins(long long x, long long y)
{
    if(y==0)
    {
        return {1,0};
    }

    auto  p = euclid_extins(y, x%y);
    long long d = x/y;
    return {p.second, p.first-d*p.second};
}

long long divi(long long a, long long b)
{
    long long r;
    while(b)
    {
       r=a%b;
       a=b;
       b=r;
    }

    return a;
}

int main()
{
    freopen("inversmodular.in", "r", stdin);
    freopen("inversmodular.out", "w", stdout);
    long long a, b;

    scanf("%lld %lld", &a, &b);\

    long long d = euclid_extins(a,b).first;

    while(d < 0)
    {
        d+=b;
    }

    cout << d;

    return 0;
}