#include <bits/stdc++.h>

using namespace std;

ifstream f("inversmodular.in");
ofstream g("inversmodular.out");

void euclid(int a, int b, int &x, int &y)
{
    if(!b)
    {
        x = 1;
        y = 0;
    }
    else
    {
        int x1,y1;
        euclid(b, a%b, x1,y1);
        x = y1;
        y = x1 - (a/b)*y1;
    }
}

int main()
{
    int a, n,d,x,y;
    f>>a>>n;
    euclid(a,n,x,y);
    while(x < 0)
        x = x+n;
    g<<x;



    return 0;
}