#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

char*mmap();
#define RD(v) int v=0;{int c;while(c=*rp++-48,c>=0)v=v*10+c;}
#define RDL(v) long v=0;{int c;while(c=*rp++-48,c>=0)v=v*10+c;}

main(){
	char*rp=mmap(0l,12l*200002,1,2,0,0ll);
	while(*rp++!=10);
	long x=0,y=0;
	do{
		RDL(t);RDL(p);
		y-=p;
		if((y>=0?y:-y)>t-x){
			write(1,"No",2);
			_exit(0);
		}
		x=t;
		y=p;
	}while(*rp);
	write(1,"Yes",3);
	_exit(0);
}