a = int(input())
b = int(input())
c = int(input())

def calc(a, b, c):
    q1, mod1 = divmod(a, 25)
    b += q1
    q2, mod2 = divmod(b, 4)
    c += q2
    q3, mod3 = divmod(c, 10)
    return mod1 + mod2 + mod3

print(calc(a, b, c))