from scipy.optimize import linprog

p, q, r, s, t = input().split() 

c = [-1, -1, -1, -1, -1]
A = [[1, 1, 1, 0, 0], [0, 1, 1, 1, 0], [0, 0, 1, 1, 1], [1, 0, 0, 1, 1], [1, 1, 0, 0, 1]]
b = [int(p), int(q), int(r), int(s), int(t)]
bounds =[
    (0, None), 
    (0, None), 
    (0, None), 
    (0, None), 
    (0, None), 
]


res = linprog(c, A_ub=A, b_ub=b, bounds=bounds)
print(-int(res.fun))