#include <bits/stdc++.h>

using namespace std;

ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

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

int main()
{
  int a, n, x, d, y;
  fin >> a >> n;
  euclid(a, n, &d, &x, &y);
  while(x <= 0) {
    x += n;
  }
  fout << x << "\n";

  return 0;
}