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#include <iostream>
#include <string>
#include <vector>
#include <cmath>
using namespace std;
 
string s;
 
int main() {
	 long long  e,k,pk,arr[100];
	for(int i=50;i>=1;i--){
		e[50-i]=2<<pow(2,i);
	}
	int ix=0;
	cin >> k;
	pk=k;
	int flag=-1;
	while(k>1){
		for(int i=0;i<50;i++){
			if(k==e[i]){
				flag=i;
			}
		}
		k/=2;
	}
	cout << flag;
/*	ix--;
	if(arr[ix]==2)s+="101"; else s+="111";
	for(int i=ix-1;i>=0;i--){
		char m;
		if(arr[i]%2==0)m='0'; else m='1';
		s= s + m + s;
	} */
 
return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:12:9: error: invalid types ‘long long int[int]’ for array subscript
   e[50-i]=2<<pow(2,i);
         ^
prog.cpp:12:12: error: invalid operands of types ‘int’ and ‘__gnu_cxx::__promote_2<int, int, double, double>::__type {aka double}’ to binary ‘operator<<’
   e[50-i]=2<<pow(2,i);
           ~^~~~~~~~~~
prog.cpp:20:13: error: invalid types ‘long long int[int]’ for array subscript
    if(k==e[i]){
             ^

Standard output is empty