PROGRAMMING:Matrix operation
Given a square matrix of $$n times n $, this problem requires computing the sum of all elements of the matrix except the sub diagonal, the last column and the last row. The sub diagonal is the line from the upper right corner of the matrix to the lower left corner.
###Input format:
Enter the first line to give a positive integer $$n $$($$1 < n / Le 10 $$); This is followed by $$n $$rows, each giving $$n $$integers separated by spaces.
###Output format:
In one row, the sum of all elements of the matrix except the sub diagonal, the last column and the last row is given.
###Input example:
```in
four
2 3 4 1
5 6 1 1
7 1 8 1
1 1 1 1
```
###Output example:
```out
thirty-five
```
answer：If there is no answer, please comment
###Input format:
Enter the first line to give a positive integer $$n $$($$1 < n / Le 10 $$); This is followed by $$n $$rows, each giving $$n $$integers separated by spaces.
###Output format:
In one row, the sum of all elements of the matrix except the sub diagonal, the last column and the last row is given.
###Input example:
```in
four
2 3 4 1
5 6 1 1
7 1 8 1
1 1 1 1
```
###Output example:
```out
thirty-five
```
answer：If there is no answer, please comment