{"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 it does not exist, print $-1$.\n\n## Constraints\n\n*   $1 ≤ X,Y ≤ 10^9$\n*   $X$ and $Y$ are integers.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$X$ $Y$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"apc001_a","tags":[],"sample_group":[["8 6","16\n\nFor example, $16$ is a multiple of $8$ but not a multiple of $6$."],["3 3","\\-1\n\nA multiple of $3$ is a multiple of $3$."]],"created_at":"2026-03-03 11:01:14"}}