直接模拟2333
#include<cstdio>
#include<algorithm>
using namespace std;
int n,ans;
void read(int &k){
k=; int f=; char c=getchar();
while (c<''||c>'')c=='-'&&(f=-),c=getchar();
while (''<=c&&c<='')k=k*+c-'',c=getchar();
k*=f;
}
int main(){
read(n);
while (n!=){
if (n&) n=n*+;
else n=n/;
ans++;
}
printf("%d",ans);
}