// what is matter? never mind. 
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,sse4,popcnt,abm,mmx,avx,avx2") 
#include<bits/stdc++.h>
#define For(i,a,b) for(int i=(a);i<=(b);++i)
#define Rep(i,a,b) for(int i=(a);i>=(b);--i)
#define ll long long
#define ull unsigned long long
#define int long long
using namespace std;
inline int read()
{
	char c=getchar();int x=0;bool f=0;
	for(;!isdigit(c);c=getchar())f^=!(c^45);
	for(;isdigit(c);c=getchar())x=(x<<1)+(x<<3)+(c^48);
	if(f)x=-x;return x;
}
 
#define mod 998244353
struct modint{
	int x;
	modint(int o=0){x=o;}
	modint &operator = (int o){return x=o,*this;}
	modint &operator +=(modint o){return x=x+o.x>=mod?x+o.x-mod:x+o.x,*this;}
	modint &operator -=(modint o){return x=x-o.x<0?x-o.x+mod:x-o.x,*this;}
	modint &operator *=(modint o){return x=1ll*x*o.x%mod,*this;}
	modint &operator ^=(int b){
		modint a=*this,c=1;
		for(;b;b>>=1,a*=a)if(b&1)c*=a;
		return x=c.x,*this;
	}
	modint &operator /=(modint o){return *this *=o^=mod-2;}
	friend modint operator +(modint a,modint b){return a+=b;}
	friend modint operator -(modint a,modint b){return a-=b;}
	friend modint operator *(modint a,modint b){return a*=b;}
	friend modint operator /(modint a,modint b){return a/=b;}
	friend modint operator ^(modint a,int b){return a^=b;}
	friend bool operator ==(modint a,int b){return a.x==b;}
	friend bool operator !=(modint a,int b){return a.x!=b;}
	bool operator ! () {return !x;}
	modint operator - () {return x?mod-x:0;}
	bool operator <(const modint&b)const{return x<b.x;}
};
inline modint qpow(modint x,int y){return x^y;}

vector<modint> fac,ifac,iv;
inline void initC(int n)
{
	if(iv.empty())fac=ifac=iv=vector<modint>(2,1);
	int m=iv.size(); ++n;
	if(m>=n)return;
	iv.resize(n),fac.resize(n),ifac.resize(n);
	For(i,m,n-1){
		iv[i]=iv[mod%i]*(mod-mod/i);
		fac[i]=fac[i-1]*i,ifac[i]=ifac[i-1]*iv[i];
	}
}
inline modint C(int n,int m){
	if(m<0||n<m)return 0;
	return initC(n),fac[n]*ifac[m]*ifac[n-m];
}
inline modint sign(int n){return (n&1)?(mod-1):(1);}

#define fi first
#define se second
#define pb push_back
#define mkp make_pair
typedef pair<int,int>pii;
typedef vector<int>vi;

#define maxn 2000005
#define inf 0x3f3f3f3f

int n,m,k;
void XOR(vector<int>&f,int x)
{
	int n=f.size();
	for(int l=2,k=1;l<=n;l<<=1,k<<=1)
		for(int i=0;i<n;i+=l)
			for(int j=0;j<k;++j){
				int a=f[i|j],b=f[i|j|k];
				f[i|j]=(a+b),f[i|j|k]=(a-b);
			}
	if(x==-1){
		for(auto&x:f)x/=n;
	}
}

int get(){
	string s;
	cin>>s;
	int res=0;
	for(auto c:s)res=res*2+(c=='B');
	return res;
}

signed main()
{
	n=read(),m=read(),k=read();
	vi f; f.resize(1<<m);
	For(i,1,n){
		int s=get();
		++f[s];
	}
	XOR(f,1);
	For(i,0,(1<<m)-1)f[i]*=f[i];
	XOR(f,-1);
	For(i,0,(1<<m)-1)f[i]/=2;
	For(i,0,m-1)
		For(j,0,(1<<m)-1)
			if(j>>i&1)f[j]+=f[j^(1<<i)];
	int res=0;
	For(i,1,(1<<m)-1)
		if(f[(1<<m)-1]-f[(1<<m)-1-i]>=k)++res;
	cout<<res;
	return 0;
}
/*
4 4
1 4 7
4 3 2
2 1 1
1 3 6
*/