#include <iostream>
#include <fstream>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
void EuclidExtins(int a, int b, int &d, int &x, int &y)
{
    int x1 = 0, y1 = 1;
    x = 1, y = 0;
    while(b != 0)
        {
            int q = a / b;
            int r = a % b;
            a = b;
            b = r;
            int x0 = x - x1 * q;
            int y0 = y - y1 * q;
            x = x1;
            y = y1;
            x1 = x0;
            y1 = y0;
        }
    d = a;
}

int main()
{
    int A, N, X, Y, d;
    f>>A>>N;
    EuclidExtins(A, N, d, X, Y);
    X %= N;
    if(X < 0)X += N;
    g<<X;
    return 0;
}