#include<fstream>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int a,b,c,n;
int cmmdc(int a,int b, int &x,int &y)
{
    if (b==0)
    {
        x=1;
        y=0;
        return a;
    }
    int d=cmmdc(b,a%b,x,y);
    int aux=x;
    x=y;
    y=aux-y*(a/b);
    return d;
}

int main()
{
    f>>a>>n;
    int x,y;
    cmmdc(a,n,x,y);
    while(x<0)
        x=x+n;
    g<<x%n;
    return 0;
}