# with open('./2020/01.test') as input:
with open('./2020/01.input') as input:
    input_list = input.read().split('\n')
    for i in range(len(input_list)):
        input_list[i] = int(input_list[i])

for i in range(len(input_list) - 1):
    for i2 in range(i + 1, len(input_list)):
        if 2020 - input_list[i] == input_list[i2]:
            print(input_list[i] * input_list[i2])

for i in range(len(input_list) - 2):
    for i2 in range(i + 1, len(input_list) - 1):
        for i3 in range(i2 + 1, len(input_list)):
            if 2020 - input_list[i] - input_list[i2] == input_list[i3]:
                print(input_list[i] * input_list[i2] * input_list[i3])