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