API Response (JSON)
{
"problem": {
"name": "B. Lucky Numbers",
"description": {
"content": "Petya loves lucky numbers. Everybody knows that positive integers are lucky if their decimal representation doesn't contain digits other than 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, ",
"description_type": "Markdown"
},
"platform": "Codeforces",
"limit": {
"time_limit": 2000,
"memory_limit": 262144
},
"difficulty": "None",
"is_remote": true,
"is_sync": true,
"sync_url": null,
"sign": "CF95B"
},
"statements": [
{
"statement_type": "Markdown",
"content": "Petya loves lucky numbers. Everybody knows that positive integers are lucky if their decimal representation doesn't contain digits other than 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, ...",
"is_translate": false,
"language": "English"
},
{
"statement_type": "Markdown",
"content": "Petya 喜欢幸运数字。众所周知，正整数如果其十进制表示中不包含除 #cf_span[4] 和 #cf_span[7] 以外的数字，则被称为 #cf_span(class=[tex-font-style-underline], body=[lucky])。例如，数字 #cf_span[47]、#cf_span[744]、#cf_span[4] 是幸运的，而 #cf_span[5]、#cf_spa...",
"is_translate": true,
"language": "Chinese"
},
{
"statement_type": "Markdown",
"content": "**Definitions** \nLet $ S $ be the set of *super lucky* numbers: \n$$ S = \\left\\{ m \\in \\mathbb{Z}^+ \\mid \\text{decimal representation of } m \\text{ contains only digits } 4 \\text{ and } 7, \\text{ and...",
"is_translate": false,
"language": "Formal"
}
]
}