/* 
 * File:   main.cpp
 * Author: virtualdemon
 *
 * Created on March 23, 2010, 4:30 PM
 */
#include <cstdio>
#include <cstdlib>


/*
 *
 */
using namespace std;
inline void gcd( int a, int b, int& x, int& y )
{
    if( !b )
    {
        x=1;
        y=0;
    }
    else {
            gcd( b, a%b, x, y );
            int aux;
            aux=x;
            x=y;
            y=aux-a/b*y;
        }
}
int main( void )
{
    int A, N, inv, y;
    fscanf( fopen( "inversmodular.in", "rt" ), "%d%d", &A, &N );
    gcd( A, N, inv, y );
    if( inv <= 0 )
        inv=N+inv%N;
    fprintf( fopen( "inversmodular.out", "wt" ), "%d", inv );
    return EXIT_SUCCESS;
}