static pair compPow ( pair complex , int k , int M ) {
  pair res = new pair ( 1 , 0 ) ;
  while ( k > 0 ) {
    if ( k % 2 == 1 ) {
      res = Multiply ( res , complex , M ) ;
    }
    complex = Multiply ( complex , complex , M ) ;
    k = k >> 1 ;
  }
  return res ;
}

static pair compPow ( pair complex , int k , int M ) { pair res = new pair ( 1 , 0 ) ; while ( k > 0 ) { if ( k % 2 == 1 ) { res = Multiply ( res , complex , M ) ; } complex = Multiply ( complex , complex , M ) ; k = k >> 1 ; } return res ; }
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