#include <cstdio>

using namespace std;

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

int invers(int a, int n)
{
    int x, y;

    euclidExtins(a, n, x, y);

    while(x <= 0)
    {
        x += n;
    }

    return x;
}

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

    int a, n;
    scanf("%d %d", &a, &n);
    printf("%d", invers(a, n));

    return 0;
}