#include <bits/stdc++.h>
#define FastIO ios_base::sync_with_stdio(false) , cin.tie(0) , cout.tie(0)
#define FILES freopen("inversmodular.in" , "r" , stdin) , freopen("inversmodular.out" , "w" , stdout)

using namespace std;

int a , n;

int euclid(int A , int B , int &X , int &Y)
{
    if(B == 0)
    {
        X = 1;
        Y = 0;
        return A;
    }

    int X0 , Y0;
    int D = euclid(B , A % B , X0 , Y0);

    X = Y0;
    Y = X0 - A / B * Y0;

    return D;
}

int invmod()
{
    int X , Y;
    euclid(a , n , X , Y);

    if(X < 0)
        return X + n;

    return X;
}

signed main()
{
	#ifndef ONLINE_JUDGE
		FastIO , FILES;
	#endif

    cin >> a >> n;
    cout << invmod();

    return 0;
}