#include <iostream>
#include <fstream>

using namespace std;

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

void euclidextins(int a, int b, int &d, int &x, int &y)
{
    if(b==0)
    {
        x=1;y=0;d=a;
    }else
    {
        int x0,y0;
        euclidextins(b,a%b,d,x0,y0);
        x=y0;
        y=x0-(a/b)*y0;
    }
}

int inversmod(int a, int n)
{
    int d,x,y;
    euclidextins(a,n,d,x,y);
    while(x<0) x+=n;
    return x;
}


int main()
{

    int a,n;

    f>>a>>n;
    g<<inversmod(a,n);


    return 0;
}