#include <bits/stdc++.h>

using namespace std;

ifstream fin ("inversmodular.in");
ofstream fout ("inversmodular.out");

int a,n,x, y;

void euclid( int a, int b, int &x, int &y )
{
    if(b==0)
    {
        x=1;
        y=0;
        return;
    }
    int x0, y0;
    int c=a/b;
    euclid(b,a%b,x0,y0);
    x=y0;
    y=x0-c*y0;
}

int main()
{

    fin>>a>>n;

    euclid(n,a,x,y);
    while (y<0)
        y+=n;
    fout<<y;

    return 0;
}