
#include<bits/stdc++.h>
/*#include <stdio.h>
#include <algorithm>
#include<iostream>
#include <stdlib.h>*/
//#pragma GCC optimize(3,"Ofast","inline")
using namespace std;
typedef long long ll;
const int maxn=1e6+50;
const int N=1e6+5;
const ll mod =1e9+7;
const int inf=2e9+7;
int a[25];
int main()
{ll n;scanf("%lld",&n);ll i=0;while(n>=pow(2,i)){if(n<pow(2,i+1)){printf("%lldn",i+1);return 0;}i++;}
}
#include<bits/stdc++.h>
/*#include <stdio.h>
#include <algorithm>
#include<iostream>
#include <stdlib.h>*/
//#pragma GCC optimize(3,"Ofast","inline")
using namespace std;
typedef long long ll;
const int maxn=1e6+50;
const int N=1e6+5;
const ll mod =1e9+7;
const int inf=2e9+7;
int a[25];
int main()
{ll n;scanf("%lld",&n);ll i=0;while(n>=(1ll<<i)){if(n<(1ll<<(i+1))){printf("%dn",i+1);return 0;}i++;}
}
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