#include <iostream>
#include <fstream>
using namespace std;
ifstream f ("inversmodular.in");
ofstream g("inversmodular.out");
void alg(long long a,long long b ,long long &x,long long &y)
{
    if(b==0)
    {
        x = 1;
        y = 0;
        return;
    }
    long long fost_x,fost_y;
    alg(b,a%b,fost_x,fost_y);
    x = fost_y;
    y= fost_x+(-a/b)*fost_y;
}
int main()
{
    long long a,mod,x,y;
    f >> a >> mod;
    alg(a,mod,x,y);
    long long rasp  =(x+mod)%mod;
    g << rasp;
}