import sys

input = sys.stdin.readline


def main() -> None:
    n = int(input())
    a = list(map(int, input().split()))
    d = [0 for i in range(n + 1)]
    for i in range(1, n + 1):
        if i >= 3:
            d[i] = max(d[i], d[i - 3] + a[0])
        if i >= 5:
            d[i] = max(d[i], d[i -5] + a[1])
        if i >= 10:
            d[i] = max(d[i], d[i -10] + a[2])
    print(d[n])

if __name__ == "__main__":
    main()