#include <fstream>

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