#include <bits/stdc++.h>

using namespace std;

ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

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

int main()
{
    int a,n;
    long long x,y;
    fin >> a >> n;
    cmmdc(a,n,x,y);
    if(x <= 0)x = n + x % n;
    fout << x;
    return 0;
}