#include <iostream>
#include <cstdio>
using namespace std;

int MOD, A, X;

void euclid(int a, int b, int d, int &x, int &y)
{
    if(b == 0)
    {
        x = 1;
        y = 0;
        d = a;
        return;
    }
    int x1, y1;
    euclid(b, a%b, d, x1, y1);
    x = y1;
    y = x1-(a/b)*y1;
}

void rez()
{
    int x, y, rezultat;
    scanf("%d %d", &A, &MOD);
    euclid(MOD, A, rezultat, x, y);
    X = y;
    while(X<0)
        x+=MOD;
    printf("%d", X);
}

int main()
{
    freopen("inversmodular.in", "r", stdin);
    freopen("inversmodular.out", "w", stdout);
    rez();
    return 0;
}