#include <fstream>

using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
void euclid(long long &x,long long &y,int a, int b)
{
    if(b==0)
    {
        x=1;
        y=0;
    }
    else
    {
        euclid(x,y,b,a%b);
        long long q=x;
        x=y;
        y=q-y*(a/b);
    }
}
long long r,t;
int n,m;
int main()
{
    f>>n>>m;
    euclid(r,t,n,m);
    if(r<=0)
        r=m+r%m;
    g<<r;
    return 0;
}