#include <bits/stdc++.h>
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
int main()
{
long long int a, n, aux, r, c, y, y0, y1;
y0 = 0;
y1 = 1;
fin >> a >> n;
aux = n;
while(a!=0)
{
  r = n%a;
  c = n/a;
  n = a;
  a = r;
  y = y0 - c * y1;
  y0 = y1;
  y1 = y;
}
if(y0 < 0)
  y0 = n + y0%aux;
fout << y0;
return 0;
}