public static long solve ( long k , long [ ] a , long [ ] b ) {
  long cnt = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( b [ 0 ] * a [ i ] > k ) {
      continue ;
    }
    long ok = 0 ;
    long ng = n ;
    while ( Math . abs ( ok - ng ) > 1 ) {
      long mid = ( ok + ng ) / 2 ;
      if ( b [ ( int ) mid ] * a [ i ] <= k ) {
        ok = mid ;
      }
      else {
        ng = mid ;
      }
    }
    cnt += ok + 1 ;
  }
  return cnt ;
}

public static long solve ( long k , long [ ] a , long [ ] b ) { long cnt = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( b [ 0 ] * a [ i ] > k ) { continue ; } long ok = 0 ; long ng = n ; while ( Math . abs ( ok - ng ) > 1 ) { long mid = ( ok + ng ) / 2 ; if ( b [ ( int ) mid ] * a [ i ] <= k ) { ok = mid ; } else { ng = mid ; } } cnt += ok + 1 ; } return cnt ; }
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