#include <bits/stdc++.h>

using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int a,x,y,n;
int cmmdc(int a,int b, int &x,int &y)
{
    if(b==0)
    {
        x=1;
        y=0;
        return a;
    }
    int X,Y,D;
    D=cmmdc(b,a%b,X,Y);
    x=Y;
    y=X-a/b*Y;
    return D;
}
int inversmodular(int a,int n)
{
    int x,y,d;
    d=cmmdc(a,n,x,y);
    if(d!=1)
    {
        g<<"Numar neinversabil ";
        exit(0);
    }
    x%=n;
    if(x<0)
        x+=n;
    return x;
}

int main()
{
    f>>a>>n;
    g<<inversmodular(a,n);

    return 0;
}