#include <iostream>
#include <cstdio>

using namespace std;

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

int main()
{
    int a,n;
    long long invers = 0, rest;

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

    scanf("%d %d", &a, &n);
    prog(invers, rest, a, n);

    if (invers<=0)
       invers = n + invers % n;

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

    return 0;
}