#include <fstream>
using namespace std;

void fill(int **m, int x1, int y1, int x2, int y2)
{
    for(int i=x1; i<x2; ++i)
	for(int j=y1; j<y2; ++j)
	    m[i][j] = 1;
}

int main()
{
    ifstream in("input.txt");
    ofstream out("output.txt");
    int i, j;
    int w, h;
    int **field;

    in >> w >> h;
    field = new int*[h];
    for(i=0; i<h; ++i)
	field[i] = new int[w];

    for(i=0; i<h; ++i)
	for(j=0; j<w; ++j)
	    field[i][j] = 0; // чистим

    int n; // число прямоугольников
    int x1,y1,x2,y2;
    in >> n;

    for(i=0;i<n; ++i)
    {
	in >> x1 >> y1 >> x2 >> y2;
	fill(field, x1,y1,x2,y2);
    }

    int hole = 0;
    for(i=0; i<h; ++i)
    {
	for(j=0; j<w; ++j)
	{
//	    out << field[i][j] << ' ';
	    if(field[i][j] == 0)
		++hole;
	}
//	out << '\n';
    }
    out << hole;
    return 0;
}

i=input()
n=0
b=0
maks=0
while n<len(i):
  if i[n]=='0':
    b+=1
    if maks<b:
      maks=b
  else:
    b=0
  n+=1
print(maks)


using System;

public class Program
{
  public static void Main()
  {
  string m=Console.ReadLine();
  char[] s=m.ToCharArray();
  int sum=0;
  for(int i=0;i<s.Length-4;i++)
    if((s[i]=='>' && s[i+1]=='>' && s[i+2]=='-' && s[i+3]=='-' && s[i+4]=='>') || (s[i]=='<' && s[i+1]=='-' && s[i+2]=='-' && s[i+3]=='<' && s[i+4]=='<'))
    sum++;
  Console.WriteLine(sum);
  }
}


#include <iostream>
using namespace std;
int main()
{
int n,a=0,b=1,c=0,i=0;
cin>>n;
while (c<n)
{
a=b;
b=c;
c=a+b;
i++;
}
if(c==n)cout<<1<<endl<<i;
else cout<<0;
}

using System;
using System.Collections.Generic;
using System.Linq;

public class Program
{
  public static void Main()
  {
    int n=int.Parse(Console.ReadLine());
    string[] l=Console.ReadLine().Split(' ');
    string[] l1=Console.ReadLine().Split(' ');
    int y=1;
    double max;
    double[] m=new double[n];
    double[] m1=new double[n];
    for(int i=0;i<n;i++)
      m[i]=Convert.ToDouble(l[i]);
    for(int i=0;i<n;i++)
      m1[i]=Convert.ToDouble(l1[i]);
    max=m[0]*m1[0]/100;
    for(int i=1;i<n;i++)
    if(m[i]*m1[i]/100>max)
    {max=m[i]*m1[i]/100;
      y=i+1;}
    Console.WriteLine(y);
  }
}


#include <iostream>
using namespace std;
int main()
{
int n, i, c, d;
cin >> n;
int *a = new int[n];
for (i = 0; i < n; i++)
cin >> a[i];
for (i = 0; i < n; i++)
{
c = a[i] + 1;
d = a[i] - 1;
if (c / 100000 + c / 10000 % 10 + c / 1000 % 10 == c % 10 + c % 100 / 10 + c % 1000 / 100 || d / 100000 + d / 10000 % 10 + d / 1000 % 10 == d % 10 + d % 100 / 10 + d % 1000 / 100)
cout << "Yes" << endl;
else
cout << "No" << endl;
}
}