#!/bin/bash
data = []
with open("1.txt") as f:
    for line in f:
        data.append(int(line))

for i in data:
    for j in data:
        if i != j and i + j == 2020:
            print(i * j)

for i in range(len(data)):
    for j in range(i, len(data)):
        for k in range(j, len(data)):
            if data[i] + data[j] + data[k] == 2020:
                print(data[i] * data[j] * data[k])