#include<fstream>
#include<cstring>
#include<algorithm>
#include<vector>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int a,n,x,y,d;
void euclid(int a,int b,int &d,int &x,int &y)
{
    if(b==0)
    {
        d=a;
        x=1;
        y=0;
    }
    else
    {
        int x0,y0;
        euclid(b,a%b,d,x0,y0);
        x=y0;
        y=x0-(a/b)*y0;
    }
}
int main()
{
    f>>a>>n;
    euclid(a,n,d,x,y);
    if(x<=0)
    x=n+x%n;
    g<<x;
    return 0;
}