#include using namespace std; int main(){ int N, i, cnt = 0, max = 0; int max_i; cin >> N; vector G(N, 0); vector D(N, 0); for(i = 0; i < N; i++){ cin >> G[i] >> D[i]; if(max <= G[i] - 30000*D[i]){ max = G[i] - 30000*D[i]; max_i = i; } } if(max*6 < 3000000){ cout << "NO" << endl; }else{ cout << "YES" <