#include <fstream>
using namespace std;
ifstream cin("inversmodular.in");
ofstream cout("inversmodular.out");
long long t,a,b,x,y,c;

int _gcd_Extended(int a,int b){
    if (b==0) {
        x = 1;
        y = 0;
        return a;
    }
    int next =  _gcd_Extended(b,a%b);
    long long aux = x;
    x = y;
    y = aux - (a/b)*y;
    return next;
}

int main(void) {
 cin>>a>>b;
 _gcd_Extended(a,b);
 if (x<0) cout<<x+b;
     else cout<<x;
 return 0;
}