#include <iostream>
#include <fstream>
using namespace std;
int A,N;
void euclid(int a,int b,int &d,int &x,int &y)
{
    if(b==0)
    {
        d=a;
        x=1;
        y=0;
        return;
    }
    int x0,y0;
    euclid(b,a%b,d,x0,y0);
    x=y0;
    y=x0-(a/b)*y0;
}
int main()
{
    ifstream fin("inversmodular.in");
    ofstream fout("inversmodular.out");
    fin>>A>>N;
    int x,y,d;
    euclid(A,N,d,x,y);
    if(x<=0)
        x=N+x%N;
    fout<<x;
    fout.close();
    fin.close();
    return 0;
}