#include <iostream>
#include <algorithm>
#include <cmath>
using namespace std;
int main(){
ios::sync_with_stdio(0);
int n;
while(cin>>n){
double x=log2(n),y=log2(n+1),c=log2(10);
int N=log10(n)+2;
while(1){
if(round(y+c*N-0.5)==round(x+c*N+0.5)){
cout<<int(floor(y+c*N))<<endl;
break;
}
else
N++;
}
}
}
#include <algorithm>
#include <cmath>
using namespace std;
int main(){
ios::sync_with_stdio(0);
int n;
while(cin>>n){
double x=log2(n),y=log2(n+1),c=log2(10);
int N=log10(n)+2;
while(1){
if(round(y+c*N-0.5)==round(x+c*N+0.5)){
cout<<int(floor(y+c*N))<<endl;
break;
}
else
N++;
}
}
}
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