#include <fstream>

using namespace std;

ifstream cin("inversmodular.in");
ofstream cout("inversmodular.out");

long long b,n,x,y;

void euclid_extins(long long a,long long b,long long &x,long long &y)
{
    long long x1,y1;
    if(b==0)
    {
        x=1,y=0;
        return;
    }
    euclid_extins(b,a%b,x1,y1);
    x=y1;
    y=x1-(a/b)*y1;
}

int main()
{
    cin>>b>>n;
    euclid_extins(b,n,x,y);
    while(x<=0)
        x+=n;
    cout<<x;
    return 0;
}