#include <fstream>
#define ll long long
using namespace std;

ll a, n, x, y;

void euex(ll nr1, ll nr2, ll &x, ll &y)
{
    if(!nr2)
    {
        x=1; y=0;
    }
    else
    {
        euex(nr2, nr1%nr2, x, y);
        ll x0=x;
        x=y;
        y=x0-(nr1/nr2)*y;
    }
}

int main()
{
    ifstream in("inversmodular.in");
    ofstream out("inversmodular.out");
    in>>a>>n;
    euex(a, n, x, y);
    while(x<0)
        x+=n;
    out<<x<<"\n";
    in.close();
    out.close();
    return 0;
}