#include <fstream>
using namespace std;
int x,y,n,a;
ifstream cin("inversmodular.in");
ofstream cout("inversmodular.out");
void euclid(int a, int b,int & x,int & y)
{
    if(b==0)
    {
        x=1, y=1;
    }
    else
    {
        int x1, y1;
        euclid(b, a%b, x1, y1);
        x=y1;
        y=x1-a/b*y1;
    }
}
int main()
{
    cin>>a>>n;
    int x,y;
    euclid(a, n, x,y);
    while(x<0)
        x=x+n;
    cout<<x;
    return 0;
}