#include <fstream>

using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
euclid(int a, int b, int &x, int &y)
{
    if(b==0)
    {
        x=y=1;
    }
    else
    {
        int x1, y1;
        euclid(b, a%b, x1, y1);
        x=y1;
        y=x1-a/b*y1;
    }
}

int a, n, x, y;
int main()
{
    fin>>a>>n;

    euclid(a,n,x,y);

    while(x<0)
        x=x+n;

    fout<<x;

    return 0;
}