题目描述

Now the derby is coming, to be the champion of Derby, Special week trains herself hard.

Initially, she has $n$ days to train.

Each day, she will get $k$ experience.

So, given the schedule of the training, please help her calculate the total experience she will get.

输入格式

The first line contains one positive integer $n (1\\le n\\le 10^6)$, the number of days.

Then followed n positive integers $k[i](1\\le k[i]\\le10^5)$

输出格式

One positive integer, the answer.

样例

4 
1 2 3 4

10