def getMoneySpent(keyboards, drives, b):
    expected_budget = []
    for i in keyboards:
        for j in drives:
            expected_budget.append(i+j)
    if min(expected_budget) > b:
        return -1
    else:
        can_buy = []
        for i in expected_budget:
            if i <= b:
                can_buy.append(i)
        return max(can_buy)