#include <iostream>
#include <fstream>

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

void inversmod(int a,int b,int &x, int &y)
{
    if(b==0)
    {
        x=y=1;
        return;
    }
    int x1,y1;
    inversmod(b,a%b,x1,y1);
    x=y1;
    y=x1-a/b*y1;

}
int main()
{
    int a,n,x,y;
    fin>>a>>n;
    inversmod(a,n,x,y);
    while(x<0)
        x+=n;
    fout<<x;

    return 0;
}