void main(){
  import std.stdio, std.string, std.conv, std.algorithm;

  long n; rd(n);

  auto x=1L, c=0;
  while(x<n) x*=2, c++;
  writeln(c+(x-n));
}

void rd(T...)(ref T x){
  import std.stdio, std.string, std.conv;
  auto l=readln.split;
  assert(l.length==x.length);
  foreach(i, ref e; x){
    e=l[i].to!(typeof(e));
  }
}
void wr(T...)(T x){
  import std.stdio;
  foreach(e; x) write(e, " ");
  writeln();
}