#include <fstream>

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

int euclidextins(int a, int b, int &x, int &y);
int cmmdc (int a, int b);
int a, b, c, hm, ceva, aux, x, y, n, i, p;
int main()
{
    fin>>b>>p;
    aux=euclidextins(p, b, ceva, x);
    while (x<0)
        x+=p;
    fout<<x<<'\n';
    return 0;
}
int euclidextins(int a, int b, int &x, int &y)
{
    int x1, y1, d;
    if (b==0)
    {
        x=1; y=0; return a;
    }
    d=euclidextins(b, a%b, x1, y1);
    x=y1;
    y=x1-(a/b)*y1;
    return d;
}
int cmmdc (int a, int b)
{
    if (b==0) return a;
    return cmmdc (b, a%b);
}