Problem Statement

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.

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.

Constraints

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

Sample Input 1

3 5 2 7

Sample Output 1

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.

Sample Input 2

100 600 200 300

Sample Output 2

60000

见题面 Input 部分

见题面 Output 部分