#include <fstream>
using namespace std;
void cmmdc(int a,int b,int &x,int &y)
{
    if(!b)
    {
        x=1;
        y=0;
        return ;
    }
    int x0,y0;
    cmmdc(b,a%b,x0,y0);
    x=y0;
    y=x0-(a/b)*y0;
}
int main()
{
    int a,n,x,y;
    ifstream in("inversmodular.in");
    ofstream out("inversmodular.out");
    in>>a>>n;
    cmmdc(a,n,x,y);
    while(x<0)
        x+=n;
    out<<x;

    return 0;
}