static int power ( long x , int y , int mod ) {
  long res = 1 ;
  while ( y != 0 ) {
    if ( ( y & 1 ) == 1 ) res = ( res * x ) % mod ;
    x = ( x * x ) % mod ;
    y = ( y >> 1 ) ;
  }
  return ( int ) ( res % mod ) ;
}

static int power ( long x , int y , int mod ) { long res = 1 ; while ( y != 0 ) { if ( ( y & 1 ) == 1 ) res = ( res * x ) % mod ; x = ( x * x ) % mod ; y = ( y >> 1 ) ; } return ( int ) ( res % mod ) ; }
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