#include <fstream>
#include <cstdlib>

using namespace std;
inline void gcd( int a, int b, int& x, int& y )
{
    if( 0 == b )
    {
        x=1;
        y=0;
        return;
    }
    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" );
    ofstream out( "inversmodular.out" );
    in>>a>>n;
    gcd( a, n, x, y );
    if( x < 0 )
        x+=n;
    out<<x<<'\n';
}