#include <cstdio>

using namespace std;

void euclidExtins(int x, int y, int &d, int &a, int &b)
{
    if(!y)
    {
        d = x;
        a = 1;
        b = 0;
        return;
    }
    else
    {
        int a1, b1;
        euclidExtins(y, x % y, d, a1, b1);
        a = b1;
        b = a1 - b1 * (x / y);
    }
}

int main()
{
    freopen("inversmodular.in", "r", stdin);
    freopen("inversmodular.out", "w", stdout);

    int a, n;
    int d;
    int t1, t2;

    scanf("%d %d", &a, &n);

    euclidExtins(a, n, d, t1, t2);

    if(t1 < 0)
    {
        printf("%d", t1 + n);
    }
    else
    {
        printf("%d", t1);
    }


    return 0;
}