G = []
for line in open("input"):
    words = line.split()
    valve = words[1]
    rate = words[4]
    edges = [x.strip(", ") for x in words[9:]]

    print(rate)
    rate = rate.strip(";")
    rate = rate[rate.index("=")+1:]
    rate = int(rate)
    G.append((valve, rate, edges))

print(G)

def save():
    seen = set()
    with open("input.dot", "w") as f:
        print("graph {", file=f)
        for v, r, E in G:
            if r:
                print('%s [label="%s (%s)"]' % (v, v, r), file=f)
            for e in E:
                if (e,v) not in seen:
                    print("%s -- %s" % (v,e), file=f)
                    seen.add((v,e))
        print("}", file=f)

#save()

#import astar

score = {'AA': (0, 0, [])}

# find the largest reward we can get in n steps
# then find the largest reward we can get in n+1 steps
potential = sum(r for _,r,_ in G)
minutes = 30
for _ in range(minutes):
    minutes -= 1
    next = {}
    for v, r, E in G:
        vo = v + 'o'
        s = []
        o = []
        if vo in score:
            reward, flow, open = score[vo]
            o.append((reward, flow, open))
        if v in score:
            reward, flow, open = score[v]
            # stay, don't open valve
            s.append((reward, flow, open))
            # stay in place, open valve
            if v not in open:
                reward += r*minutes
                o.append((reward, flow+r, open+[v]))
        # move here from somewhere else
        for e in E:
            if e in score:
                if v in score[e][-1]:
                    o.append(score[e])
                else:
                    s.append(score[e])
            eo = e+'o'
            if eo in score:
                if v in score[eo][-1]:
                    o.append(score[eo])
                else:
                    s.append(score[eo])
        if s:
            next[v] = max(s)
        if o:
            next[vo] = max(o)
    score = next
    print("%d minutes left" % minutes)
    for v, (r, flow, open) in sorted(score.items(), key=lambda x: x[1]):
        print("\t", v, r, "\t", ",".join(open))
print(max(r for r,_,_ in score.values()))