#include <fstream>
#include <cstring>
#include <algorithm>
#define nmax 1000010

using namespace std;

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

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

int main()
{
    int a,n,x,y;
    fin >> a >> n;
    euclidextins(a,n,x,y);
    if (x<0)
        x+=n;
    fout << x << '\n';
}