#include <fstream>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
long long n,a,inv,p;
/*long long putere(long long x,long long n)
{
    long long p;
    if(n==0) return 1;
    if(n==1) return x;
    p=putere(x,n/2);
    if(n%2==0) return (p*p)%n;
    else return (x*p*p)%n;

}*/
void gcd(long long &x,long long &y,long long a,long long b)
{
    if(b==0) {x=1;y=0;}
    else
    {gcd(x,y,b,a%b);
    long long aux=x;
    x=y;
    y=aux-y*(a/b);
    }
}
int main()
{
    f>>a>>n;
    gcd(inv,p,a,n);
    if(inv<=0) inv=n+inv%n;
    g<<inv<<" ";
    return 0;
}