#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)
{
    if (b==0)
    {
        x=1;
        y=0;
        d=a;
    }
    else
    {
        int x0,y0;
        EuclidExtins(b,a%b,d,x0,y0);
        x=y0;
        y=x0-(a/b)*y0;
    }
}

int inversMod(int A, int N) ///A si N sunr prime intre ele
{
    int d,x,y;
    EuclidExtins(A,N,d,x,y);
    while (x<0) x+=N;
    return x;
}
int main()
{
    int A,N;
    f>>A>>N;
    g<<inversMod(A,N);
    f.close();
    g.close();
    return 0;
}