#include <iostream>
#include <sstream>
#include <iomanip>
#include <vector>
#include <string>
#include <map>
#include <set>
#include <algorithm>
#include <numeric>
#include <iterator>
#include <functional>
#include <complex>
#include <queue>
#include <stack>
#include <cmath>
#include <cassert>
#include <cstring>
using namespace std;
typedef long long LL;
typedef complex<double> CMP;

class MysteriousRestaurant { public:
	int maxDays(vector <string> prices, int budget) 
	{
		for(int D=prices.size(); D>=0; --D)
			if( ok(D, prices, budget) )
				return D;
		return 0;
	}

	bool ok(int D, const vector<string>& prices, int budget)
	{
		int M = prices[0].size();

		vector< vector<int> > p(7, vector<int>(M));
		for(int i=0; i<D; ++i)
			for(int m=0; m<M; ++m)
				p[i%7][m] += toPrice(prices[i][m]);

		int cost = 0;
		for(int i=0; i<7; ++i)
		{
			int least = 0x7fffffff;
			for(int m=0; m<M; ++m)
				least = min(least, p[i][m]);
			cost += least;
		}
		return cost <= budget;
	}

	int toPrice(char c)
	{
		if(c<='9')
			return c-'0';
		if(c<='Z')
			return c-'A'+10;
		return c-'a'+36;
	}
};

// BEGIN CUT HERE
#include <ctime>
double start_time; string timer()
 { ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); }
template<typename T> ostream& operator<<(ostream& os, const vector<T>& v)
 { os << "{ ";
   for(typename vector<T>::const_iterator it=v.begin(); it!=v.end(); ++it)
   os << '\"' << *it << '\"' << (it+1==v.end() ? "" : ", "); os << " }"; return os; }
void verify_case(const int& Expected, const int& Received) {
 bool ok = (Expected == Received);
 if(ok) cerr << "PASSED" << timer() << endl;  else { cerr << "FAILED" << timer() << endl;
 cerr << "\to: \"" << Expected << '\"' << endl << "\tx: \"" << Received << '\"' << endl; } }
#define CASE(N) {cerr << "Test Case #" << N << "..." << flush; start_time=clock();
#define END	 verify_case(_, MysteriousRestaurant().maxDays(prices, budget));}
int main(){

CASE(0)
	string prices_[] = {"26", "14", "72", "39", "32", "85", "06"};
	  vector <string> prices(prices_, prices_+sizeof(prices_)/sizeof(*prices_)); 
	int budget = 13; 
	int _ = 5; 
END
CASE(1)
	string prices_[] = {"26", "14", "72", "39", "32", "85", "06", "91"};
	  vector <string> prices(prices_, prices_+sizeof(prices_)/sizeof(*prices_)); 
	int budget = 20; 
	int _ = 8; 
END
CASE(2)
	string prices_[] = {"SRM", "512"};
	  vector <string> prices(prices_, prices_+sizeof(prices_)/sizeof(*prices_)); 
	int budget = 4; 
	int _ = 0; 
END
CASE(3)
	string prices_[] = {"Dear", "Code", "rsHa", "veFu", "nInT", "heCh", "alle", "ngeP", "hase", "andb", "ecar", "eful"};
	  vector <string> prices(prices_, prices_+sizeof(prices_)/sizeof(*prices_)); 
	int budget = 256; 
	int _ = 10; 
END
/*
CASE(4)
	string prices_[] = ;
	  vector <string> prices(prices_, prices_+sizeof(prices_)/sizeof(*prices_)); 
	int budget = ; 
	int _ = ; 
END
CASE(5)
	string prices_[] = ;
	  vector <string> prices(prices_, prices_+sizeof(prices_)/sizeof(*prices_)); 
	int budget = ; 
	int _ = ; 
END
*/
}
// END CUT HERE
