#include <bits/stdc++.h>
using namespace std;

#define all(x) begin(x), end(x)
#define sz(x) (ll)(x).size()

using ll = long long;
using ld = long double;

ll normalize(ll x) {
	return (x % 360 + 360) % 360;
}

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	ll n;
	cin >> n;
	vector<ll> in(n);
	for (ll i = 0; i < n; i++) {
		cin >> in[i] >> in[i];
	}
	in.push_back(in[0]);
	ll c = in[0];
	ll l = in[0];
	ll r = in[0];
	for (ll i = 1; i <= n; i++) {
		ll left = normalize(c - in[i]);
		ll right = normalize(in[i] - c);
		if (left < right) {
			c -= left;
		} else if (right < left) {
			c += right;
		} else if (left == 0) {
		} else {
			l -= 1000;
		}
		l = min(l, c);
		r = max(r, c);
	}
	if (r-l < 360) {
		ll tmp = normalize(r);
		if (r >= 180) r -= 360;
		if (r < 0) r++;
		cout << "no " << r << "." << string(30, '9') << endl; 
	} else {
		cout << "yes" << endl;
	}
}