#include<iostream>
#include<fstream>
using namespace std;
ifstream in("inversmodular.in");
ofstream out("inversmodular.out");
int A,N;
void euclid(int a, int b, int &x, int &y);
int main()
{
    in>>A>>N;
    int x,y;
    euclid(A,N,x,y);
    while(x<0) x+=N;
    out<<x<<'\n';
}
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;
    }
}