#include <iostream>
using namespace std;
int main(){
int b, z1, z2, bz, i;
cout<<"Binarni broj: ";
cin>>b;
for (i=b; i==0 or i==1; i=i%100)
bz+=2;
z2=(i%100)%10;
z1=(i%100)/10;
if (z1==0 and z2==1) bz-=2;
else if (z1==1 and z2==0) bz-=2;
cout<<bz<<endl;}
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