#include<stdio.h>
using namespace std;

int A, N, x, y, d;

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

        euclid(b, a % b, x0, y0);
        x = y0;
        y = x0 - (a / b) * y0;
    }
}


void read()
{
        scanf("%d %d", &A, &N);
}


void solve()
{
    euclid(A, N, x, y);

    while(x < 0)
        x += N;

    printf("%d\n", x);
}



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

    read();

    solve();

    fclose(stdin);
    fclose(stdout);

    return 0;
}