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#include<bits/stdc++.h>
using namespace std;
#define elif else if
#define int long long
using namespace std;
const int sizen = 2e6+12;

int tab[sizen];
int N,K,T;
vector<int>jd;
vector<int>dw;
string st;
int mini = -1 ;
void eazy(int x)
{
	int score = 0 ; 
	int dw = x ; 
	for (int i = 1 ; i <= N ; i++)
	{
		if (dw > 0 && tab[i] == 2)
		{
			score ++ ; 
			dw -- ;
		}
		elif(tab[i] == 1 || tab[i] == 3)
		{
			score ++ ;
		}
	}
	cout << score << "\n"; 
	return;
}
void pre_tab()
{
	for (int i = 0 ; i < st.size() ; i++)
	{
		tab[i+1] = st[i]-'0';
		if (st[i] == '1')
		{
			jd.push_back(i);
		}
		elif(st[i] == '2')
		{
			dw.push_back(i);
		}
	}
}

int zlicz_lewo(int x)
{
	int score = 0 ;
	if (x < 0 )
	{
		return (-10000);
	}
	for (int i = 1 ; i <= x ; i++)
	{
		if (tab[i] == 3)
		{
			score ++ ; 
		}
	}
	return score ;
}
int zlicz_prawo(int x)
{
	int score = 0 ;
	if (x < 0)
	{
		return (-1000000);
	}
	for (int i = x ; i <= N ; i++)
	{
		if (tab[i] == 3)
		{
			score ++ ; 
		}
	}
	return score ; 
}

int wyznacz_lewo(int x)
{
	vector<int>jedynki;
	vector<int>dwojki;
	int obecny_indx = jd[x];
	int pointer = obecny_indx;
	int unos = 1 ;
	for(int i = obecny_indx-1 ; i >= max(unos,obecny_indx-T) ; i--)
	{
		if (tab[i] == 1)
		{
			jedynki.push_back(i);
		}
		elif(tab[i] == 2)
		{
			dwojki.push_back(i);
		}
	}
	int zle = jedynki.size()+dwojki.size();
	while(zle > x)
	{
		if (jedynki.size() > 0)
		{
			pointer = jedynki[jedynki.size()-1] ; 
			jedynki.clear();
			dwojki.clear();
			for (int i = pointer-1 ; i >= max(unos,pointer-T); i--)
			{
				if (tab[i] == 1)
				{
					jedynki.push_back(i); 
				}
				elif(tab[i] == 2)
				{
					dwojki.push_back(i);
				}
			}
		}
		elif (dwojki.size() > 0)
		{
			pointer = dwojki[0] ; 
			dwojki.clear();
			for (int i = pointer-1 ; i >= max(unos,pointer-T) ; i--)
			{
				if (tab[i] == 1)
				{
					jedynki.push_back(i);
				}
				elif(tab[i] == 2)
				{
					dwojki.push_back(i);
				}
			}
		}
		zle = jedynki.size()+ dwojki.size();
	}
	//cout << pointer << " KK \n"7; 
	if (pointer-T >= 0)
	{
		return pointer-T;
	}
	elif(1)
	{
		return (-100000000);
	}
}
int wyznacz_prawo(int x)
{
	
	vector<int>jedynki;
	vector<int>dwojki;
	int obecny_indx = jd[jd.size()-K+x-1];
	int pointer = obecny_indx;
	for(int i = obecny_indx+1 ; i <= min(N,obecny_indx+T) ; i++)
	{
		if (tab[i] == 1)
		{
			jedynki.push_back(i);
		}
		elif(tab[i] == 2)
		{
			dwojki.push_back(i);
		}
	}
	int zle = jedynki.size()+dwojki.size();
	while(zle > x)
	{
		if (jedynki.size() > 0)
		{
			pointer = jedynki[jedynki.size()-1] ; 
			jedynki.clear();
			dwojki.clear();
			for (int i = pointer+1 ; i <= min(N,pointer+T); i++)
			{
				if (tab[i] == 1)
				{
					jedynki.push_back(i); 
				}
				elif(tab[i] == 2)
				{
					dwojki.push_back(i);
				}
			}
		}
		elif (dwojki.size() > 0)
		{
			pointer = dwojki[0] ; 
			dwojki.clear();
			jedynki.clear();
			for (int i = pointer+1 ; i <= min(N,pointer+T) ; i++)
			{
				if (tab[i] == 1)
				{
					jedynki.push_back(i);
				}
				elif(tab[i] == 2)
				{
					dwojki.push_back(i);
				}
			}
		}
		zle = jedynki.size()+ dwojki.size();
	}
	if (pointer+T <= N+1)
	{
		return pointer+T;
	}
	elif(1)
	{
		return (-100000000);
	}
}
void solve(int indx)
{
	//cout << wyznacz_lewo(indx) << "\n" << wyznacz_prawo(indx) ; 
	//return ;  
	mini = max(zlicz_lewo(wyznacz_lewo(indx)-1) + zlicz_prawo(wyznacz_prawo(indx)+1),mini);
	//cout << mini << "\n" ; 
}
void solve()
{
	if (K < jd.size())
	{
		for (int i = 0 ; i <= K ; i ++)
		{
			solve(i); 
			//return;
		}
		cout << mini ; 
	}
	elif(1)
	{
		//cout << "deamz " ; 
		eazy(K-jd.size());
	}
}
int32_t main()
{
	ios_base::sync_with_stdio(NULL);
	cin.tie(NULL);
	cin >> N >> K >> T;
	cin >> st ;
	pre_tab();
	solve(); 
	return 0 ;
}