#include<iostream>
#include<cstdint>

int MinHitNum(int corrent,int goal);

int main(){
    std::int32_t goal,count,bisquitnum;
    std::cin >> goal;
    count=0;
    bisquitnum=1;
    if(goal==1){
        count=0;
    }
    else{
        while(bisquitnum<(goal+1)/2){
            bisquitnum*=2;
            count++;
        }
        count+=1;
    }
    std::cout << count << std::endl;
}