#include <vector>
#include <map>
#include <set>
#include <algorithm>
#include <functional>
#include <utility>
#include <sstream>
#include <iostream>
#include <cmath>
#include <ctime>
#include <limits>
#include <iterator>
#include <bitset>
#define sz(m)((m).size())
#define all(a)a.begin(),a.end()
#define forn(i,n)for(int i=0,i##e=n;i<i##e;++i)
#define fori(i,m)forn(i,sz(m))
#define each(i,m)for(typeof(m.begin())i=m.begin(),i##e=m.end();i!=i##e;++i)
#define srt(s)sort(all(s))
#define dump(m)copy(all(m),ostream_iterator<typeof(m[0])>(cout,"\n"));cout<<endl
using namespace std;

struct TheDevice {
	int minimumAdditional(vector <string> plates) {
		int m = 0;
		fori (j, plates[0]) {
			int c = 0;
			fori(i, plates)
				c += plates[i][j] - '0';
			m = max(m, max(2 - c, 0) + max(1 - (int)plates.size() + c, 0));
		}
		return m;
	}
};



double test0() {
	string t0[] = {"010",
 "011",
 "101"};
	vector <string> p0(t0, t0+sizeof(t0)/sizeof(string));
	TheDevice * obj = new TheDevice();
	clock_t start = clock();
	int my_answer = obj->minimumAdditional(p0);
	clock_t end = clock();
	delete obj;
	cout <<"Time: " <<(double)(end-start)/CLOCKS_PER_SEC <<" seconds" <<endl;
	int p1 = 1;
	cout <<"Desired answer: " <<endl;
	cout <<"\t" << p1 <<endl;
	cout <<"Your answer: " <<endl;
	cout <<"\t" << my_answer <<endl;
	if (p1 != my_answer) {
		cout <<"DOESN'T MATCH!!!!" <<endl <<endl;
		return -1;
	}
	else {
		cout <<"Match :-)" <<endl <<endl;
		return (double)(end-start)/CLOCKS_PER_SEC;
	}
}
double test1() {
	string t0[] = {"0",
 "1",
 "0",
 "1"};
	vector <string> p0(t0, t0+sizeof(t0)/sizeof(string));
	TheDevice * obj = new TheDevice();
	clock_t start = clock();
	int my_answer = obj->minimumAdditional(p0);
	clock_t end = clock();
	delete obj;
	cout <<"Time: " <<(double)(end-start)/CLOCKS_PER_SEC <<" seconds" <<endl;
	int p1 = 0;
	cout <<"Desired answer: " <<endl;
	cout <<"\t" << p1 <<endl;
	cout <<"Your answer: " <<endl;
	cout <<"\t" << my_answer <<endl;
	if (p1 != my_answer) {
		cout <<"DOESN'T MATCH!!!!" <<endl <<endl;
		return -1;
	}
	else {
		cout <<"Match :-)" <<endl <<endl;
		return (double)(end-start)/CLOCKS_PER_SEC;
	}
}
double test2() {
	string t0[] = {"01010101",
 "10101010"};
	vector <string> p0(t0, t0+sizeof(t0)/sizeof(string));
	TheDevice * obj = new TheDevice();
	clock_t start = clock();
	int my_answer = obj->minimumAdditional(p0);
	clock_t end = clock();
	delete obj;
	cout <<"Time: " <<(double)(end-start)/CLOCKS_PER_SEC <<" seconds" <<endl;
	int p1 = 1;
	cout <<"Desired answer: " <<endl;
	cout <<"\t" << p1 <<endl;
	cout <<"Your answer: " <<endl;
	cout <<"\t" << my_answer <<endl;
	if (p1 != my_answer) {
		cout <<"DOESN'T MATCH!!!!" <<endl <<endl;
		return -1;
	}
	else {
		cout <<"Match :-)" <<endl <<endl;
		return (double)(end-start)/CLOCKS_PER_SEC;
	}
}
double test3() {
	string t0[] = {"10010101011",
 "00010101001",
 "00100010111",
 "00101010101",
 "01010111101"};
	vector <string> p0(t0, t0+sizeof(t0)/sizeof(string));
	TheDevice * obj = new TheDevice();
	clock_t start = clock();
	int my_answer = obj->minimumAdditional(p0);
	clock_t end = clock();
	delete obj;
	cout <<"Time: " <<(double)(end-start)/CLOCKS_PER_SEC <<" seconds" <<endl;
	int p1 = 1;
	cout <<"Desired answer: " <<endl;
	cout <<"\t" << p1 <<endl;
	cout <<"Your answer: " <<endl;
	cout <<"\t" << my_answer <<endl;
	if (p1 != my_answer) {
		cout <<"DOESN'T MATCH!!!!" <<endl <<endl;
		return -1;
	}
	else {
		cout <<"Match :-)" <<endl <<endl;
		return (double)(end-start)/CLOCKS_PER_SEC;
	}
}
double test4() {
	string t0[] = {"1101001011010",
 "0010000010101",
 "1010101011110",
 "1101010100111",
 "1011111110111"};
	vector <string> p0(t0, t0+sizeof(t0)/sizeof(string));
	TheDevice * obj = new TheDevice();
	clock_t start = clock();
	int my_answer = obj->minimumAdditional(p0);
	clock_t end = clock();
	delete obj;
	cout <<"Time: " <<(double)(end-start)/CLOCKS_PER_SEC <<" seconds" <<endl;
	int p1 = 0;
	cout <<"Desired answer: " <<endl;
	cout <<"\t" << p1 <<endl;
	cout <<"Your answer: " <<endl;
	cout <<"\t" << my_answer <<endl;
	if (p1 != my_answer) {
		cout <<"DOESN'T MATCH!!!!" <<endl <<endl;
		return -1;
	}
	else {
		cout <<"Match :-)" <<endl <<endl;
		return (double)(end-start)/CLOCKS_PER_SEC;
	}
}

int main() {
	int time;
	bool errors = false;
	
	time = test0();
	if (time < 0)
		errors = true;
	
	time = test1();
	if (time < 0)
		errors = true;
	
	time = test2();
	if (time < 0)
		errors = true;
	
	time = test3();
	if (time < 0)
		errors = true;
	
	time = test4();
	if (time < 0)
		errors = true;
	
	if (!errors)
		cout <<"You're a stud (at least on the example cases)!" <<endl;
	else
		cout <<"Some of the test cases had errors." <<endl;
}