// what is matter? never mind. 
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,sse4,popcnt,abm,mmx,avx,avx2") 
#include<bits/stdc++.h>
#define For(i,a,b) for(int i=(a);i<=(b);++i)
#define Rep(i,a,b) for(int i=(a);i>=(b);--i)
#define ll long long
#define ull unsigned long long
//#define int long long
using namespace std;
inline int read()
{
	char c=getchar();int x=0;bool f=0;
	for(;!isdigit(c);c=getchar())f^=!(c^45);
	for(;isdigit(c);c=getchar())x=(x<<1)+(x<<3)+(c^48);
	if(f)x=-x;return x;
}

#define fi first
#define se second
#define pb push_back
#define mkp make_pair
typedef pair<int,int>pii;
typedef vector<int>vi;

#define maxn 1000005
#define inf 0x3f3f3f3f

int n,x[maxn],t[maxn];
int can[maxn],pre[maxn],pos[maxn];
int f[maxn],g[maxn];
int dis(int i,int j){return abs(x[i]-x[j]);}

signed main()
{
	n=read();
	For(i,1,n)t[i]=read(),x[i]=read(),f[i]=g[i]=inf;
	For(i,1,n){
		can[i]=can[i-1]+(t[i-1]+dis(i,i-1)>t[i]);
		pre[i]=i;
		if(i>1 && x[i-1]==x[i])pre[i]=pre[i-1];
	}
	f[0]=g[0]=0;
	pos[0]=0;
	For(i,1,n)pos[i]=pre[i-1];
	/*
	put clone at x[i],get [0,pos[i]]
	f[i] : self  take pos[i]
	g[i] : clone take pos[i]
	*/
	For(i,1,n){
		Rep(j,i-2,0)
			if(can[i-1]-can[j+1]==0){
				if(x[i]!=x[j]){
					int tim=max(t[j],max(f[j]+dis(i,j),t[pos[j]]+dis(pos[j],i)));
					if(tim+dis(i,j+1)<=t[j+1]) f[i]=min(f[i],tim);
					tim=max(t[j],g[j]+dis(i,j));
					if(tim+dis(i,j+1)<=t[j+1]) f[i]=min(f[i],tim);
				}else{
					if(g[j]+dis(j,j+1)<=t[j+1]) f[i]=min(f[i],g[j]);
					if(max(f[j]+dis(j,j+1),t[pos[j]]+dis(pos[j],j+1))) f[i]=min(f[i],f[j]);
				}
			}
			else break;
		
		if(x[i-1]==x[i]){
			f[i]=min(f[i],f[i-1]);
			g[i]=min(g[i],g[i-1]);
		}else{
			g[i]=min(g[i],max(t[i-1],g[i-1]+dis(i-1,i)));
		//	g[i]=min(g[i],max(t[i-1],max(f[i-1],t[pos[i-1]])+dis(i-1,i)));
			g[i]=min(g[i],max(max(t[i-1],t[pos[i-1]]+dis(pos[i-1],i)),f[i-1]+dis(i-1,i)));
		}
		if(f[i]>t[i])f[i]=inf;
		if(g[i]>t[i])g[i]=inf;
	}
	if(min(f[n],g[n])<inf)puts("YES");
	else puts("NO");
	return 0;
}
/*

*/