#include <fstream>
using namespace std;

ifstream f("inversmodular.in");
ofstream g("inversmodular.out");

long long A,N;


void euclid(int a,int b,int &x,int &y)
{
    if(b==0)
    {
        x=1;y=0;
    }
    else
    {

        euclid(b,a%b,x,y);
        long long aux=x;
        x=y;
        y=aux-y*(a/b);
    }
}

int main()
{
f>>A>>N;
int X,Y;
euclid(A,N,X,Y);
while(X<=0)
    X=X+X%N;
g<<X;
f.close();
g.close();
}