//Author: Kevin
#include<bits/stdc++.h>
//#pragma GCC optimize("O2")
using namespace std;
#define ll long long
#define ull unsigned ll
#define pb emplace_back
#define mp make_pair
#define ALL(x) (x).begin(),(x).end()
#define rALL(x) (x).rbegin(),(x).rend()
#define srt(x) sort(ALL(x))
#define rev(x) reverse(ALL(x))
#define rsrt(x) sort(rALL(x))
#define sz(x) (int)(x.size())
#define inf 0x3f3f3f3f
#define pii pair<int,int>
#define lb(v,x) (int)(lower_bound(ALL(v),x)-v.begin())
#define ub(v,x) (int)(upper_bound(ALL(v),x)-v.begin())
#define uni(v) v.resize(unique(ALL(v))-v.begin())
#define longer __int128_t
void die(string S){puts(S.c_str());exit(0);}
int n;
ll x[205],y[205];
vector<ll> pool;
ll dp[1005];
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n;
	vector<pair<ll,ll>> v1;
	for(int i=1;i<=n;i++)
	{
		ll l,r;
		cin>>l>>r;
		v1.pb(l,r);
		x[i]=(l+r)/2;
		y[i]=(r-l)/2;
	}
	ll sum=0;
	ll LL=-1e18,RR=-1e18;
	srt(v1);
	for(auto pr:v1)
		if(pr.first<=RR)
			RR=max(RR,pr.second);
		else
		{
			sum+=RR-LL;
			LL=pr.first;
			RR=pr.second;
		}
	sum+=RR-LL;
	for(int i=1;i<=n;i++)
	{
		pool.pb(x[i]-y[i]);
		pool.pb(x[i]+y[i]);
		pool.pb(x[i]);
	}
	srt(pool);
	uni(pool);
	for(int i=1;i<=sz(pool);i++)
	{
		ll pos=pool[i-1];
		for(int j=1;j<=n;j++)
			if(x[j]>pos)
			{
				ll L=max(pos,x[j]-y[j]);
				ll R=x[j];
				for(int round=1;round<=n;round++)
				{
					int ok=0;
					for(int k=1;k<=n;k++)
						if(k!=j&&x[k]<=R&&x[k]>pos)
							if(x[k]+y[k]>R)
							{
								R=x[k]+y[k];
								ok=1;
							}
					if(!ok) break;
				}
				dp[ub(pool,R)]=max(dp[ub(pool,R)],dp[i]+R-L);
			}
		for(int j=1;j<=n;j++)
			if(x[j]>pos)
			{
				ll L=x[j];
				ll R=x[j]+y[j];
				for(int round=1;round<=n;round++)
				{
					int ok=0;
					for(int k=1;k<=n;k++)
						if(k!=j&&x[k]<=R&&x[k]>pos)
							if(x[k]+y[k]>R)
							{
								R=x[k]+y[k];
								ok=1;
							}
					if(!ok) break;
				}
				dp[ub(pool,R)]=max(dp[ub(pool,R)],dp[i]+R-L);
			}
	}
	ll res=*max_element(dp,dp+sz(pool)+1);
	if(res==sum)
		cout<<"YES\n";
	else
		cout<<"NO\n";
	return 0;
}