long long

#include<bits/stdc++.h>//submitRecord//
using namespace std;
//const int N=1e7+10;
int main(){
//freopen("","r",stdin);
//freopen("","w",stdout);
ios::sync_with_stdio();
cin.tie(nullptr);
cout.tie(nullptr);
long long n;
cin>>n;
long long day=0;
for(int i=n;i>=1;i/=2){
day+=1;
}
cout<<day;
//fclose(stdin);
//fclose(stdout);
return 0;
}