#include <stdio.h>

#define ll long long

int A, N;

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

int main()
{
    ll inv = 0, ins;

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

    scanf("%d %d", &A, &N);
    gcd(inv, ins, A, N);

    if (inv <= 0)
        inv = N + inv % N;

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

    return 0;
}