import copy
import threading
import time

class calcThread(threading.Thread):
    def __init__(self, cups, result):
        self.cups = cups
        self.result = result
        threading.Thread.__init__(self)
    def run(self):
        count = 0
        cups = self.cups
        while(cups[1]!=0 or cups[2] !=0):
            count+=1

            if cups[1] and cups[2] :
                cups[0] += 2
                cups[1] -= 1
                cups[2] -= 1
                continue

            if cups[1] == 0:
                cups[1] += 2
                cups[0] -= 1
                cups[2] -= 1
                continue

            if cups[2] == 0:
                cups[2] += 2
                cups[0] -= 1
                cups[1] -= 1
                continue
        self.result[0] = count

def water_move(cups):
    count = [[0],[0],[0]]
    threadholder = []
    for x in xrange(3):
        c = copy.copy(cups)
        c[0], c[x] = c[x], c[0]
        threadholder.append(calcThread(c, count[x]))
        threadholder[-1].setDaemon(True)
        threadholder[-1].start()

    while (1):
        for x in range(3):
            if not threadholder[x].isAlive():
                return count[x][0]
        

#print water_move([3,1,12])
print water_move([827392,65536,122880])