#include <fstream>
#define int long long
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;
        return;
    }
    int x0,y0;
    euclid(b,a%b,x0,y0);
    x = y0;
    y = x0 - (a/b)*y0;
}
int32_t main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int nr,n;
    cin >> nr >> n;
    int x,y;
    euclid(nr,n,x,y);
    while (x<0)
        x = x + n;
    cout << x;
    return 0;
}