#include <bits/stdc++.h>
using namespace std;
int main() {
cin.tie(0);
ios::sync_with_stdio(false);
int n, k;
cin >> n >> k;
int a, b; bool res = true;
cin >> a;
while (a != 0) {
cin >> b;
if (b == k) {res = false;}
cin >> a;
}
if (res) {
cout << "Yes";
} else {
cout << "No";
}
return 0;
}
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