#include<bits/stdc++.h>
using namespace std;
const int in=1e5+10;
const int inf=0x3f3f3f3f;
#define LL long long
LL n,x,y;
double p,cnt;
string a,b;
int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin>>p>>a>>b;
	for(int i=0;i<a.size();i++)if(a[i]==b[i])cnt++;
	double ans=cnt/a.size();
	if(ans>=p)cout<<"yes";
	else cout<<"no";
	return 0;
}

#include<bits/stdc++.h> 
using namespace std; 
const int N=1e3+10; 
int main(){ 
    char a[N],b[N]; 
    double n; 
    cin>>n>>a>>b; 
    double cnt; 
    for(int i=0;i<strlen(a);i++) if(a[i]==b[i]) cnt++;  
    double r=cnt/strlen(a); 
    if(r>n) cout<<"yes";
    else cout<<"no"; 
}

#include<bits/stdc++.h> using namespace std; const int N=1e3+10; int main(){ char a[N],b[N]; double x; cin>>x>>a>>b; double cnt; int len=strlen(a); for(int i=0;i<len;i++){ if(a[i]==b[i]){ cnt++; } } double y=cnt/len; if(y>x){ cout<<"yes"; } else cout<<"no"; }

#include<bits/stdc++.h> using namespace std; int s_s(int a){

} int main(){ string a,b; double n,s=0; cin>>n; cin>>a>>b; for(int i=0;i<a.size();i++){ if(a[i]==b[i])s++; }

if(n<=s/a.size())cout<<"yes";
else cout<<"no";

return 0; } //荣泽仁

#include<bits/stdc++.h>
using namespace std;
double cnt;
string a,b;
double ans;
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>cnt>>a>>b;
	for(int i=0;i<a.size();i++)
	{
		if(a[i]==b[i])ans++;
	}
	int len=a.size();
	ans=ans/len;
	if(ans>=cnt)printf("yes");
	else printf("no");
	return 0;
}