key = 811589153
numbers = [int(i) * key for i in open("input.txt", "r").read().split()]
idx = [i for i in range(len(numbers))]


def mix(numbers, idx):
    for i in range(len(idx)):
        index = idx.index(i)
        n = numbers[index]
        if n == 0:
            continue
        new_index = index + n
        if abs(new_index) > len(numbers) - 1:
            new_index = new_index % (len(numbers) - 1)
        if new_index == 0:
            new_index = len(numbers) - 1
        elif new_index == len(numbers) - 1:
            new_index = 0
        numbers.pop(index)
        idx.pop(index)
        numbers.insert(new_index, n)
        idx.insert(new_index, i)
    # idx = idx[numbers.index(0) :] + idx[: numbers.index(0)]
    return numbers, idx


for i in range(10):
    numbers, idx = mix(numbers, idx)

rotated = numbers[numbers.index(0) :] + numbers[: numbers.index(0)]
rest = [x % len(rotated) for x in [1000, 2000, 3000]]
print(sum([rotated[r] for r in rest]))