#include <fstream>

using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

int EuclidExtins(int a, int b, int &x, int&y);
int main()
{
    int A,N;
    fin>>A>>N;

    int x,y;
    EuclidExtins(A,N,x,y);

    if(x <= 0)
        x = N+ x%N;

    fout<<x<<'\n';
    return 0;
}


int EuclidExtins(int a, int b, int &x, int&y)
{
    if(b == 0)
    { x = 1; y = 0; return a; }

    int x1,y1;
    int d = EuclidExtins(b,a%b, x1, y1);
    x = y1;
    y = x1 - y1*(a/b);
    return d;
}