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