{"raw_statement":[{"iden":"problem statement","content":"Given a positive integer $N$, find the maximum integer $k$ such that $2^k \\le N$."},{"iden":"constraints","content":"*   $N$ is an integer satisfying $1 \\le N \\le 10^{18}$."},{"iden":"input","content":"Input is given from Standard Input in the following format:\n\n$N$"},{"iden":"sample input 1","content":"6"},{"iden":"sample output 1","content":"2\n\n*   $k=2$ satisfies $2^2=4 \\le 6$.\n*   For every integer $k$ such that $k \\ge 3$, $2^k > 6$ holds.\n\nTherefore, the answer is $k=2$."},{"iden":"sample input 2","content":"1"},{"iden":"sample output 2","content":"0\n\nNote that $2^0=1$."},{"iden":"sample input 3","content":"1000000000000000000"},{"iden":"sample output 3","content":"59\n\nThe input value may not fit into a $32$\\-bit integer."}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}