// http://www.infoarena.ro/problema/inversmodular
#include <stdio.h>
#include <stdlib.h>

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

int main()
{
    FILE *f, *g;
    int A, N;
    int d, x, y;

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

    scanf("%d %d", &A, &N);

    euclidExtins(A, N, &d, &x, &y);
    // x poate fi negativ deci adunam N pana obtinem numar pozitiv
    while(x < 0)
        x += N;
    printf("%d", x);

    fclose(f);
    fclose(g);

    return 0;
}