#include <fstream>
#include <iostream>
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

void euclid(int a, int b, int &d, int &x, int &y)
{
    if(b==0)
    {
        d=a;
        x=1;
        y=0;
    }
    else
    {
        int x0, y0;
        euclid(b,a%b,d,x0,y0);
        x=y0;
        y=x0-(a/b)*y0;
    }
}
int main()
{
    int a,n,d,x=0,y=0;
    fin >> a >> n;
    euclid(a,n,d,x,y);
    while(x<0)
        x=x+n;
    fout << x%n;
    return 0;
}