What do the first two rows in cProfile output refer to?

I do not uderstand the meaning of the item in the last column in the second row. Whereas, I want to know that is the total time in the third row (0.399) includes all the times below it?? If so, why when I decreased the time taken for running len() the time in the second row decreased by amount greater than the amount the len() decreased by??

     ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.000    0.000    0.473    0.473 <string>:1(<module>)
        1    0.399    0.399    0.473    0.473 linear + binary.py:1(linear_search)
        1    0.000    0.000    0.473    0.473 {built-in method exec}
  1000003    0.074    0.000    0.074    0.000 {built-in method len}
        1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}