3e not supported between tuple and int

1def buildTree(tuples) :
2    while len(tuples) > 1 :
3        leastTwo = tuple(tuples[0:2])                  # get the 2 to combine
4        theRest  = tuples[2:]                          # all the others
5        combFreq = leastTwo[0][0] + leastTwo[1][0]     #enter code here the branch points freq
6        tuples   = theRest + [(combFreq,leastTwo)]     # add branch point to the end
7        tuples.sort()                                  # sort it into place
8    return tuples[0]            # Return the single tree inside the list
9