#include <bits/stdc++.h>

using namespace std;

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

int a, n, x, y;

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

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