Warren and Stock Trading

Warren has recently started to trade stocks. Since he is new to the game, he needs your help. On a particular day, a stock has an opening price and a closing price. Both of these are integers. The gradient of a stock is defined as the ratio of the closing price to the opening price. Gradient can be a non-integer number. For each x, such that a ≤ x ≤ b, and each y such that c ≤ y ≤ d, there exists