Garden

AtCoder

IDabc106_a

Time2000ms

Memory256MB

Difficulty—

There is a farm whose length and width are $A$ yard and $B$ yard, respectively. A farmer, John, made a vertical road and a horizontal road inside the farm from one border to another, as shown below: (The gray part represents the roads.) ![image](https://img.atcoder.jp/ghi/27d063746b460f1132b6a99aa535a562.png) What is the area of this yard excluding the roads? Find it. ## Constraints * $A$ is an integer between $2$ and $100$ (inclusive). * $B$ is an integer between $2$ and $100$ (inclusive). ## Input Input is given from Standard Input in the following format: $A$ $B$ [samples] ## Note It can be proved that the positions of the roads do not affect the area.

Samples

Input #1

2 2

Output #1

1

In this case, the area is $1$ square yard.

Input #2

5 7

Output #2

24

In this case, the area is $24$ square yards.

API Response (JSON)

{
  "problem": {
    "name": "Garden",
    "description": {
      "content": "There is a farm whose length and width are $A$ yard and $B$ yard, respectively. A farmer, John, made a vertical road and a horizontal road inside the farm from one border to another, as shown below: (",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc106_a"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "There is a farm whose length and width are $A$ yard and $B$ yard, respectively. A farmer, John, made a vertical road and a horizontal road inside the farm from one border to another, as shown below: (...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

Full JSON Raw Segments