P3009 [USACO11JAN] Profits S

The cows have opened a new business, and Farmer John wants to see how well they are doing. The business has been running for $N (1 \leq N \leq 10^5)$ days, and every day i the cows recorded their net profit $P_i (-1,000\leq P_i \leq 1,000)$. Farmer John wants to find the largest total profit that the cows have made during any consecutive time period. (Note that a consecutive time period can range in length from one day through $N$ days.) Help him by writing a program to calculate the largest sum of consecutive profits.

- Line $1$: A single integer: $N$. - Lines $2\dots N+1$: Line $i+1$ contains a single integer: $P_i$.

- Line $1$: A single integer representing the value of the maximum sum of profits for any consecutive time period.

The maximum sum is obtained by taking the sum from the second through the sixth number $(4, 9, -2, -5, 8) \geq 14$.