Competitions

# Lesson 8. October 22 - 28. Recursive functions. Two dimentional arrays.

# Sum of positive in matrix

Given matrix of size **n** * **n**. Find the sum of its positive elements.

#### Input

First line contains number **n** (**1** ≤ **n** ≤ **100**). Next lines contains the **n** * **n** matrix. All numbers in the matrix are no more than **100** by absolute value.

#### Output

Print the sum of positive numbers in the matrix.

Input example #1

3 4 -2 5 1 -4 -12 0 1 -3

Output example #1

11