P21403 [AtCoder] There are two rectangles.
普及-
题目描述

There are two rectangles.
The lengths of the vertical sides of the first rectangle are A, and the lengths of the horizontal sides of the first rectangle are B.
The lengths of the vertical sides of the second rectangle are C, and the lengths of the horizontal sides of the second rectangle are D.
Print the area of the rectangle with the larger area.
If the two rectangles have equal areas, print that area.

-----Constraints-----
- All input values are integers.
- 1≤A≤10^4
- 1≤B≤10^4
- 1≤C≤10^4
- 1≤D≤10^4

-----Input-----
The input is given from Standard Input in the following format:
A B C D

-----Output-----
Print the area of the rectangle with the larger area.
If the two rectangles have equal areas, print that area.

-----Sample Input-----
3 5 2 7

-----Sample Output-----
15

The first rectangle has an area of 3×5=15, and the second rectangle has an area of 2×7=14.
Thus, the output should be 15, the larger area.

输入格式

见题面

输出格式

见题面

样例输入
3 5 2 7
样例输出
15