Contest Duration: - (local time) (100 minutes) Back to Home
A - Two Rectangles /

Time Limit: 2 sec / Memory Limit: 256 MB

問題文

この二つの長方形のうち、面積の大きい方の面積を出力してください。 なお、二つの長方形の面積が等しい時は、その面積を出力してください。

• 入力は全て整数である
• 1≦A≦10^4
• 1≦B≦10^4
• 1≦C≦10^4
• 1≦D≦10^4

入力

A B C D


入力例 1

3 5 2 7


出力例 1

15


入力例 2

100 600 200 300


出力例 2

60000


どちらの長方形の面積も 60000 なので、60000 を出力します。

Score : 100 points

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