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