{"problem":{"name":"Tax Rate","description":{"content":"Takahashi bought a piece of apple pie at ABC Confiserie. According to his memory, he paid $N$ yen (the currency of Japan) for it. The consumption tax rate for foods in this shop is $8$ percent. That i","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"sumitb2019_b"},"statements":[{"statement_type":"Markdown","content":"Takahashi bought a piece of apple pie at ABC Confiserie. According to his memory, he paid $N$ yen (the currency of Japan) for it.\nThe consumption tax rate for foods in this shop is $8$ percent. That is, to buy an apple pie priced at $X$ yen before tax, you have to pay $X \\times 1.08$ yen (rounded down to the nearest integer).\nTakahashi forgot the price of his apple pie before tax, $X$, and wants to know it again. Write a program that takes $N$ as input and finds $X$. We assume $X$ is an integer.\nIf there are multiple possible values for $X$, find any one of them. Also, Takahashi's memory of $N$, the amount he paid, may be incorrect. If no value could be $X$, report that fact.\n\n## Constraints\n\n*   $1 \\leq N \\leq 50000$\n*   $N$ is an integer.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$N$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"sumitb2019_b","tags":[],"sample_group":[["432","400\n\nIf the apple pie is priced at $400$ yen before tax, you have to pay $400 \\times 1.08 = 432$ yen to buy one.  \nOtherwise, the amount you have to pay will not be $432$ yen."],["1079",":(\n\nThere is no possible price before tax for which you have to pay $1079$ yen with tax."],["1001","927\n\nIf the apple pie is priced $927$ yen before tax, by rounding down $927 \\times 1.08 = 1001.16$, you have to pay $1001$ yen."]],"created_at":"2026-03-03 11:01:13"}}