#include <iostream>
#include <fstream>
using namespace std;

ifstream in("inversmodular.in");
ofstream out("inversmodular.out");
int A,N;
void euclid(long long &x, long long &y,int a,int b)
{
    if(b==0)
    {
        x=1;
        y=0;
    }
    else
    {
        euclid(x,y,b,a%b);
        long long aux=x;
        x=y;
        y=aux-y*(a/b);
    }
}
int main()
{   long long inv=0,ins;
    in>>A>>N;
euclid(inv,ins,A,N);
if(inv<=0)
    inv=N+inv%N;
out<<inv;

    return 0;
}