#include <bits/stdc++.h>
#define ll long long
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int a,n;

void Read()
{
    f>>a>>n;
    f.close();
}

void gcd(ll &x,ll &y,int a,int b)
{
    if(!b)
    {
        x = 1;
        y = 0;
    }
    else
    {
        gcd(x, y, b,a % b);
        ll aux = x;
        x = y;
        y = aux - y * (a / b);
    }
}

int main()
{
    ll inv = 0, ins;
    Read();
    gcd(inv, ins, a, n);

    while(inv <= 0)
        inv = n + inv % n;
    g<<inv;
    g.close();
    return 0;
}