#G. 矩阵对角线元素之和

Type: RemoteJudge

1000ms

64MiB

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说明

给定一个 $3×3$ 的矩阵，请你求出对角线元素之和。

按照行优先顺序输入一个 $3×3$ 矩阵，每个矩阵元素均为整数且取值范围为 [ $1$ , $9$ ]。

输出从左下角到右上角这条对角线上的元素之和。

1 2 3
3 4 5
6 0 1