#include <iostream>
#include <cstdio>

using namespace std;

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

int getInvers(int a, int mod)
{
    int d, x, y;
    euclid(a, mod, d, x, y);
    if (x < 0)
        x += ((-x)/mod+1) * mod;
    return x%mod;
}

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

    int a, n;

    scanf("%d %d", &a, &n);

    int rez = getInvers(a, n);

    printf("%d", rez);

    return 0;
}