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- #include<iostream>
- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- long long n;
- cin>>n;
- long long decimalNumber = 0, i = 0, remainder;
- while (n!=0)
- {
- remainder = n%10;
- n /= 10;
- decimalNumber += remainder*pow(2,i);
- ++i;
- }
- // cout<<decimalNumber<<endl;
- int pos=0;
- for(int j=0;j<pow(2,100);j++)
- {
- if(pow(4,j)<decimalNumber)
- {
- pos++;
- }
- else
- break;
- }
- cout<<pos<<endl;
- return 0;
- }
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