simple sum november long challenge 2015

why i am getting wrong answer in simple sum problem .here is my solution for third subtask my ans is showing wrong answer.detailed explaination

Hi @rahulsup
It’s maybe an overflow issue for some big values of N




The answer is 999965000307
Your code gives 546397322511

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Power function returns double, so (p+1) is also converted to double… Try type casting (long long int)pow()

hi @beroul my code is showing correct output on my compiler

Ooops. You’re right.
bad copy paste.

Good anser is 777764555617
You code gives 777764555616

thanks @beroul i will try to find where to correct my code