def Check(V, A, B, C, INF = 1<<64):
    ret = INF
    for i in range(31):
        if (i * C) > V:
            break
        for j in range(31):
            if (i * C) + (j * B) > V:
                break
            for k in range(31):
                if (i * C) + (j * B) + (k * A) > V:
                    break
                if (i * C) + (j * B) + (k * A) == V:
                    ret = min(ret, i + j + k)
    return ret

INF = 1<<64
V = list(map(int,input().split()))
ans = INF
for A in range(1,31):
    for B in range(A+1,31):
        for C in range(B+1,31):
            cnt = 0
            for i in range(4):
                cnt += Check(V[i], A, B, C)
            ans = min(ans, cnt)
print(ans)