#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <cmath>
#include <string>
#include <vector>
#include <algorithm>
#include <queue>
#include <map>
#include <functional>
#include <set>
#include <numeric>
#include <stack>
#include <utility>
//#include "util.h"

using namespace std;
typedef long long lint;
typedef pair<lint, lint> Pii;

#define PI 3.14159265358979323846
#define EPS 1e-6
#define MOD ((lint)1000000007)
#define MIN(a,b) ((a)<(b)?(a):(b))
#define MAX(a,b) ((a)>(b)?(a):(b))



int main()
{
	bool flag = false;
	int N, G, D;
	cin >> N;
	for (int i = 0; i < N; i++) {
		cin >> G >> D;
		if ((G - 30000 * D) * 6 >= 3000000)
			flag = true;
	}
	cout << (flag ? "YES" : "NO") << endl;

	return 0;
}