include

using namespace std; int main() {

int a;
cin >> a;
if (a == 0) {
    cout << 1 << endl;
    return 0;
}    
int count = 0; 
int temp = a;  
while (temp > 0) {
    temp = temp / 2;
    count++;
}   
cout << count << endl;
return 0;

}