/* 
 * File:   main.cpp
 * Author: virtualdemon
 *
 * Created on May 5, 2010, 3:12 PM
 */
#include <cstdlib>
#include <fstream>

/*
 * 
 */
using namespace std;
inline void gcd( int a, int b, int& x, int& y )
{
    if( !b )
        x=1, y=0;
    else {
            int x0, y0;
            gcd( b, a%b, x0, y0 );
            x=y0;
            y=x0-(a/b)*y0;
         }
}
int main(int argc, char** argv)
{
    int A, N, x, y;
    ifstream in( "inversmodular.in" );
    ofstream out( "inversmodular.out" );
    in>>A>>N;
    gcd( A, N, x, y );
    out<<( ( 0LL+x%N+N )%N )<<'\n';
    return (EXIT_SUCCESS);
}