#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <queue>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <fstream>
#include <iterator>
#include <random>
#include <assert.h>
using namespace std;

const string file = "inversmodular";

const string infile = file + ".in";
const string outfile = file + ".out";

const int INF = 0x3f3f3f3f; 

//#define ONLINE_JUDGE

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

int main()
{
#ifdef ONLINE_JUDGE
	ostream &fout = cout;
	istream &fin = cin;
#else
	fstream fin(infile.c_str(), ios::in);
	fstream fout(outfile.c_str(), ios::out);
#endif	

    int A, N;
    fin >> A >> N;

    int x, y;
    int d = euclidExtins(A, N, x, y);
    while(x < 0) x += N;
    while(x >= N) x -= N;
    fout << x << "\n";

#ifdef ONLINE_JUDGE
#else
    fout.close();
	fin.close();
#endif
}