python

k = float(input())
a = input()
b = input()
cnt = 0
for i in range(len(a)):
    if a[i] == b[i]:
        cnt += 1
if cnt / len(a) >= k:
    print("yes")
else:
    print("no")

c++

#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

int main()
{
    double k; string a, b;
    cin >> k >> a >> b;

    int cnt = 0;
    for (int i = 0; i < a.size(); i ++) {
        if (a[i] == b[i]) cnt ++;
    }
    if (cnt*1.0 / a.size() >= k) puts("yes");
    else puts("no");

    return 0;
}