#include <cstdlib>
#include <fstream>

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