#include <fstream>
#define ll long long
using namespace std;
void gcd(ll x,ll y,int a,int b) {
  if (b==0) x=1,y=0;
  else {
    gcd(x,y,b,a%b);
    ll aux=x;
    x=y;
    y=aux-y*(a/b);
  }
}
int main()
{   ll x=0,y;int a,n;
    ifstream f("inversmodular.in");
    ofstream g("inversmodular.out");
    f>>a>>n;
    gcd(x,y,a,n);
    if (x<0) x=n+x%n;
    g<<x;
    return 0;
}