#include <iostream>
#include <iomanip>
#include <string>
#include <sstream>
#include <algorithm>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <fstream>
#include <stack>
#include <map>
#include <cstring>
#include <cmath>
#include <set>
#include <iterator>
#include <cmath>
#include <locale>

using namespace std;

string ToBinary(char c)
{
	static int mask[] = { 1, 2, 4, 8, 16, 32, 64, 128 };
	string result;
	int i = 8;
	while( i-- )
	{
		result += (c & mask[i]) ? '1' : '0';
	}
	return result;
}
//The white kitten had had nothing to do with it
string sum(const string s1, const string s2) {
    int len1 = s1.size(), len2 = s2.size(), bit1, bit2;
    string ls1 = len1<len2 ? s1 : s2, ls2 = len1<len2 ? s2 : s1, result;
    for (int i = ls1.size(); i < ls2.size(); ++i) ls1 = '0' + ls1;
    int carry = 0;
    for (int i = ls2.size() - 1; i >= 0; --i) {
        bit1 = ls1.at(i) - '0';
        bit2 = ls2.at(i) - '0';
        char sum = (bit1 ^ bit2 ^ carry) + '0';
        result = sum + result;
        carry = (bit1&carry)|(bit2&carry)|(bit1&bit2);
    }
    if (carry) result = '1' + result;
        return result;
    }
int main() {
    int answ = 0, kol = 0;
    string str2, str3, str4 = "";
    getline(cin, str2);
    for (auto i = 0; i < str2.size(); i += 2){
        for (auto j = 1; j <= str2.size() - i  ; ++j)
        {
            if ((i + j - 1) % 3 == 0){
                kol = 0;
                str3 = str2.substr(i, j);
                for(auto el:str3)
                {
                    ++kol;
                    if (kol == 1)
                        str4 = ToBinary(el);
                    else
                        str4 = sum(str4, ToBinary(el));
                }
                if (count(str4.begin(), str4.end(), '1') % 2 != 0 )
                    answ += 1;
            }
        }
    }
    cout << answ;
    return 0;
}