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

int x, y, d;

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

int main()
{
    int a, m; 
    fin >> a >> m;

    cmmdc(a, m, d, x, y);

    while(x <= 0)
        x = x + m;

    fout << x;

    return 0;
}