Two Integers

AtCoder

IDapc001_a

Time2000ms

Memory256MB

Difficulty—

You are given positive integers $X$ and $Y$. If there exists a positive integer not greater than $10^{18}$ that is a multiple of $X$ but not a multiple of $Y$, choose one such integer and print it. If it does not exist, print $-1$. ## Constraints * $1 ≤ X,Y ≤ 10^9$ * $X$ and $Y$ are integers. ## Input Input is given from Standard Input in the following format: $X$ $Y$ [samples]

Samples

Input #1

8 6

Output #1

16

For example, $16$ is a multiple of $8$ but not a multiple of $6$.

Input #2

3 3

Output #2

\-1

A multiple of $3$ is a multiple of $3$.

API Response (JSON)

{
  "problem": {
    "name": "Two Integers",
    "description": {
      "content": "You are given positive integers $X$ and $Y$. If there exists a positive integer not greater than $10^{18}$ that is a multiple of $X$ but not a multiple of $Y$, choose one such integer and print it. If",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "apc001_a"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "You are given positive integers $X$ and $Y$. If there exists a positive integer not greater than $10^{18}$ that is a multiple of $X$ but not a multiple of $Y$, choose one such integer and print it. If...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

Full JSON Raw Segments