Problems
Sum of positive in matrix
Sum of positive in matrix
Matrix of size $n \cdot n$ is given. Find the sum of its positive elements.
\InputFile
First line contains number $n~(1 \le n \le 100)$. Next lines contains the $n \cdot n$ matrix. All numbers in the matrix are no more than $100$ by absolute value.
\OutputFile
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