from itertools import combinations

a, b, c, d = map(int, input().split())
INF = 10**18
ans = INF
for C in combinations(range(1, 31), 3):
    x, y, z = C
    DP = [INF for _ in range(31)]
    for i in range(30 // x + 1):
        for j in range(30 // y + 1):
            if x * i + y * j > 30:
                break
            for k in range(30 // z + 1):
                if x * i + y * j + z * k > 30:
                    break
                res = x * i + y * j + z * k
                DP[res] = min(DP[res], i + j + k)
    if DP[a] == INF or DP[b] == INF or DP[c] == INF or DP[d] == INF:
        continue
    ans = min(ans, DP[a] + DP[b] + DP[c] + DP[d])
print(ans)