Addition Error!

Mike added all positive integers from 1 to n on his calculator and obtained a total of 2015. By mistake, however, he had entered one number twice. Find the correct total \(a\) that Mike should have obtained and the number \(b\) that he added twice.

Write the answers separated by a period, \((a.b)\).

For example, if you think that \(a = 100, b= 35\) is the solution, submit your answer as 100.35.

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