Tuna

Fisherman Šime caught $N$ tunas last night. Using a special app, he offered them for sale to a well-known Japanese company that buys quality fish. How does the app estimate the value, or price, of a tuna?

From a photo of the tuna, the app returns two estimates, $P_1$ and $P_2$. If the difference between the estimates is less than or equal to $X$, the higher estimate is taken. If the difference is strictly greater than $X$, the app returns a third estimate $P_3$, and that estimate is taken as the final value of the tuna.

Given the estimates for each of the $N$ tunas (sometimes two of them, sometimes three), write a program that outputs the total value of the caught tunas.

The first line contains the integer $N$ ($1 \le N \le 20$), the number of tunas.

The second line contains the integer $X$ ($1 \le X \le 10$) described above.

Then $N$ blocks follow, one per tuna, each in one of these two forms:

• One line with two integers $P_1$ and $P_2$ ($1 \le P_1, P_2 \le 100$).
• One line with two integers $P_1$ and $P_2$ ($1 \le P_1, P_2 \le 100$), followed by a second line with the integer $P_3$ ($1 \le P_3 \le 100$).

The second form is used when the difference between $P_1$ and $P_2$ is greater than $X$.

Output the total value of the caught tunas on a single line.