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