#include <stdio.h>
#include <stdlib.h>

int  n;
int  A;

void fcc(long long &x, long long &y, int a, int b)
{
    if (!b)
        x = 1, y = 0;
    else
    {
        fcc(x, y, b, a % b);
        long long aux = x;
        x = y;
        y = aux - y * (a / b);
    }
}

int main()
{
    long long sol = 0, s;

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

    scanf("%d %d", &A, &n);
    fcc(sol, s, A, n);

    if (sol <= 0)
        sol = n + sol % n;

    printf("%lld\n", sol);

    return 0;
}