#include <cstdio>

int A, N, x, y;

void cmmdc(int a, int b, int &x, int &y)
{
    int x1, y1;
    if (b)
    {
        cmmdc(b, a % b, x1, y1);
        x = y1;
        y = x1 - y1 * (a / b);
        return;
    }
    x = 1;
    y = 0;
}

void Citire()
{
    scanf("%d %d", &A, &N);
}

void Rezolvare()
{
    cmmdc(A, N, x, y);
    if (x < 0)
        x += N;
    printf("%d", x);
}

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

    Citire();
    Rezolvare();

    return 0;
}