import itertools
from sys import exit

V = set(map(int, input().split()))
if len(V) <= 3:
    print(4)
    exit()

MV = max(V)
ans = float('inf')
for T in itertools.combinations(range(1, MV + 1), 3):
    table = [float('inf')] * (MV + 1)
    table[0] = 0
    for i in range(MV + 1):
        if bef := tuple(table[i - t] + 1 for t in T if i - t >= 0):
            table[i] = min(bef)
    ans = min(ans, sum(table[v] for v in V))
print(ans)