Editorial for COCI '16 Contest 1 #1 Tarifa

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How many megabytes would Pero have available in the $N+1$ ~N+1~ month if he didn't spend any? The answer is $(N+1) \times X$ ~(N+1) \times X~ megabytes. How many megabytes did Pero spend in the first $N$ ~N~ months since activating his plan? The answer is $P_1 + P_2 + \dots + P_N$ ~P_1 + P_2 + \dots + P_N~. The number of megabytes that Pero has available in the $N+1$ ~N+1~ month of using the plan is obtained by subtracting the spent megabytes from the total possible number of megabytes.

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