Trapezoids

AtCoder

IDabc045_a

Time2000ms

Memory256MB

Difficulty—

You are given a trapezoid. The lengths of its upper base, lower base, and height are $a$, $b$, and $h$, respectively. ![image](https://atcoder.jp/img/arc061/1158e37155d46a42e90f31566478e6da.png)An example of a trapezoid Find the area of this trapezoid. ## Constraints * $1≦a≦100$ * $1≦b≦100$ * $1≦h≦100$ * All input values are integers. * $h$ is even. ## Input The input is given from Standard Input in the following format: $a$ $b$ $h$ [samples]

Samples

Input #1

3
4
2

Output #1

7

When the lengths of the upper base, lower base, and height are $3$, $4$, and $2$, respectively, the area of the trapezoid is $(3+4)×2/2 = 7$.

Input #2

4
4
4

Output #2

16

In this case, a parallelogram is given, which is also a trapezoid.

API Response (JSON)

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  "problem": {
    "name": "Trapezoids",
    "description": {
      "content": "You are given a trapezoid. The lengths of its upper base, lower base, and height are $a$, $b$, and $h$, respectively. ![image](https://atcoder.jp/img/arc061/1158e37155d46a42e90f31566478e6da.png)An ex",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
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    "difficulty": "None",
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  "statements": [
    {
      "statement_type": "Markdown",
      "content": "You are given a trapezoid. The lengths of its upper base, lower base, and height are $a$, $b$, and $h$, respectively.\n\n![image](https://atcoder.jp/img/arc061/1158e37155d46a42e90f31566478e6da.png)An ex...",
      "is_translate": false,
      "language": "English"
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