Anna was playing with her calculator. She presses '9' and then '+' and then '19', then '+' then '9' and then '+' and '19' continuously. After a while she checks the result to be 3117. How many times did she pressed buttons on the calculator?
[3117 - 9] / 28 = 111 regular periods of 5 each.
111 x 5 + 1 ==556 Keysrokes to get 3117
