Consider a chess board with *r* rows and *c* columns,
where every square contains between 0 and 9 coins.
Write a program such that, given a chess board,
computes the total number of coins on it.

**Input**

Input begins with the number of rows *r*
and the number of columns *c*.
Follow *r* lines, each one with *c* characters
between ‘`0`’ and ‘`9`’.

**Output**

Print the total number of coins on the board.

Public test cases

**Input**

3 4 2735 0479 1508

**Output**

51

**Input**

1 20 01234567890123456789

**Output**

90

**Input**

2 1 4 5

**Output**

9

Information

- Author
- Salvador Roura
- Language
- English
- Translator
- Salvador Roura
- Original language
- Catalan
- Other languages
- Catalan
- Official solutions
- C++ Java Python
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