# coding: utf-8
INF = 10 ** 20
MOD = 10 ** 9 + 7


def II(): return int(input())
def ILI(): return list(map(int, input().split()))


def read():
    R, G, B = ILI()
    return R, G, B


def solve(R, G, B):
    min_all = min(R, G, B)
    l_dif = [ele - min_all for ele in [R, G, B]]
    l_dif.sort(reverse=True)
    dif_1 = l_dif[0]
    dif_2 = l_dif[1]

    ans = min_all
    if dif_1 >= dif_2 * 3:
        ans += dif_2
        ans += (dif_1 - dif_2) // 5
    else:
        div, mod = divmod((dif_1 - dif_2), 2)
        ans += div
        dif_1 = dif_2 + mod - div
        dif_2 = dif_2 - div
        state = 0
        while dif_1 >= 3 or dif_2 >= 3:
            if state == 0:
                dif_1 -= 3
                dif_2 -= 1
            elif state == 1:
                dif_1 -= 3
                dif_2 -= 1
            ans += 1
            state = (state + 1) % 2

    return ans


def main():
    params = read()
    print(solve(*params))


if __name__ == "__main__":
    main()