#include <fstream>

#define int long long

using namespace std;

ifstream f("inversmodular.in");
ofstream g("inversmodular.out");

int a,n,x,y;

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


}

signed main(){

    f>>a>>n;
    euclid(a,n,x,y);
    if(x<0){
        x = n + x%n;
    }
    g<<x;
    return 0;
}