#include <fstream>

using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

void cmmdc(int &x, int &y, int a, int b)
{
    if(!b){x=1;y=0;}
    else
    {
        cmmdc(x,y,b,a%b);
        int aux=x;
        x=y;
        y=aux-y*(a/b);
    }
}
int main()
{
    int a, n,inv,c;
    inv=0;
    fin>>a>>n;
    cmmdc(inv,c
          ,a,n);
    if (inv<=0)
       inv=n+inv%n;
    fout<<inv<<"\n";
    return 0;
}