Competitions

# Two dimensional arrays

# Theater revenue

The theater has **n** rows with **m** seats. Two matrices are given. The first one contains the ticket prices for each seat. The second matrix tells which tickets are sold and which are not (**1** means the ticket is sold for a corresponding seat, **0** - is not sold).

Determine the total revenue from the performance.

#### Input

The first line contains **n** and **m** (**n**, **m** ≤ **500**). Then the matrix with ticket prices is given (**n** lines with **m** numbers, each number ranges from **0** to **10000**). Then given the matrix of sold tickets - **n** lines with **m** numbers.

#### Output

Print the total revenue from ticket sales.

Input example #1

3 3 1 2 3 4 5 6 7 8 9 1 0 1 0 1 0 1 0 1

Output example #1

25