bzoj 1192 二进制

原题传送门http://www.lydsy.com/JudgeOnline/problem.php?id=1192

继续刷水题，二进制思想

//By BLADEVIL
var
    x                    :longint;
begin
    read(x);
    writeln(trunc(ln(x)/ln(2))+1);
end.