#include <iostream>
#include <fstream>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int n,m,x,y;
void euclidex (int a,int b,int &i,int &j)
{
    if (b==0)
    {
        i=1;
        j=1;
    }
    else
    {
        int i1,j1;
        euclidex(b,a%b,i1,j1);
        i=j1;
        j=i1-a/b*j1;
    }
}
int main()
{
    f>>n>>m;
    euclidex(n,m,x,y);
    while (x<0)
    {
        x+=m;
    }
    g<<x;
    return 0;
}