# Sum of positive in matrix

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

Matrix of size $n⋅n$ is given. 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.

## Examples

Input #1

Answer #1

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