#include <iostream> #include <string> using namespace std; int main() { double threshold; string dna1, dna2; cin >> threshold >> dna1 >> dna2; int length = dna1.length(); int matches = 0; for (int i = 0; i < length; i++) { if (dna1[i] == dna2[i]) { matches++; } } double similarity = static_cast<double>(matches) / length; if (similarity >= threshold) { cout << "yes" << endl; } else { cout << "no" << endl; } return 0; }