#include <fstream>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
void solve(long long &x,long long &y,int a,int b)
{
    if(!b)
    {
        x=1;
        y=0;
    }
        else
        {
            solve(x,y,b,a%b);
            long long aux=x;
            x=y;
            y=aux-y*(a/b);
        }
}
long long a,n,inv,ins;
int main()
{
    f>>a>>n;
    solve(inv,ins,a,n);
    if(inv<=0)
        inv=n+inv%n;
    g<<inv;
    return 0;
}