#include <iostream>
#include <fstream>
using namespace std;
 int cmmdc(int a, int b,int &x,int &y) //ALGORITMUL LUI EUCLID EXTINS
    {
    if(b==0)
    {   x=1;
        y=0;
        return a;
    }


    int d=cmmdc(b,a%b,x,y);

    int xn=y;
     y=x-y*(a/b);
     x=xn;

     return d;
    }
int main()
{
    ifstream cin("inversmodular.in");
    ofstream cout("inversmodular.out");

    int a,n,x,y;
    cin>>a>>n;
    cmmdc(a,n,x,y);

    while(x<0) x+=n;

    cout<<x%n;
    return 0;
}