#include <iostream>
#include <fstream>
using namespace std;

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

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


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

    while(x<0)
        x+=n;
    fout<<x;
    return 0;
}