morangos OBI

# obi 2016
# nivel junior f1
# by Deukaus / Matheus Santos
# https://olimpiada.ic.unicamp.br/pratique/pj/2016/f1/morango/

local1c = int(input())
local1l = int(input())

local2c = int(input())
local2l = int(input())

a1 = local1c * local1l

a2 = local2c * local2l

if a1 > a2:
    print(a1)
else:
    print(a2)