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.

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 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