SP1433 KPSUM - The Sum

One of your friends wrote numbers 1, 2, 3, ..., N on the sheet of paper. After that he placed signs + and - between every pair of adjacent digits alternately. Now he wants to find the value of the expression he has made. Help him. For example, if N=12 then +1 -2 +3 -4 +5 -6 +7 -8 +9 -1+0 -1+1 -1+2 = 5

Each line contains one integer number N (1≤ N ≤ 10 $ ^{15} $ ). Last line contains 0 and shouldn't be processed. Number of lines in the input does not exceed 40.

For every line in the input write the answer on a separate line.