{"trustable":true,"sections":[{"title":"","value":{"format":"MD","content":"In the forest the lake with lilies started to bloom. On the first day only one lily bloomed, and then every day the number of blooming lilies doubled. On the **n**-th day the whole lake was covered with blooming lilies. At what day the half of the lake surface was covered with blooming lilies?\r\n\r\n![prb2059](https://static.e-olymp.com/content/ea/ea511aafd108deaf03a896bcd87a7ec907ea8848.jpg)\r\n\r\n#### Input\r\nThe number of days **n** (**1** \u003c **n** ≤ **200**) when the entire surface of the lake was covered with blooming lilies.\r\n\r\n#### Output\r\nPrint the day number when half of the lake surface was covered with blooming lilies."}},{"title":"Example","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e3\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e2\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}