#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
using namespace std;

int main()
{
    const vector<unsigned char> tmp = {0xE2, 0x80, 0xA6};

    int len = 0;
    int ans = 0;
    for(;;){
        vector<unsigned char> v(1);
        if(!(cin >> v[0]))
            break;

        int n = 1;
        while(v[0] & (1 << (7 - n)))
            ++ n;

        v.resize(n);
        for(int i=1; i<n; ++i)
            cin >> v[i];

        if(v == tmp){
            ++ len;
            ans = max(ans, len);
        }
        else{
            len = 0;
        }
    }
    cout << ans << endl;

    return 0;
}