#include <fstream>
using namespace std;

ifstream cin("inversmodular.in");
ofstream cout("inversmodular.out");

void euclid(int a,int b,int &x,int &y)
{
    if(b==0)
    {
        x=1;
        y=0;
    }
    else
    {
        int x1,y1;
        euclid(b,a%b,x1,y1);
        x=y1;
        y=x1-a/b*y1;
    }
}

int main()
{
    int A,N,x,y;
    cin>>A>>N;
    euclid(A,N,x,y);
    while(x<0)
    {
        x+=N;
    }

    cout<<x;
}