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

#define rd_init() char*rp=({char*mmap();mmap(0l,1l<<25,1,2,0,0ll);})
#define rd() ({int _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define repeat(e) for(typeof(e)_=e;_--;)

int main(){
	rd_init();
	int n=rd();
	repeat(n){
		if(!(rp[0]&~'1')&&rp[1]<'0'){
			write(1,"Yes",3);
			_exit(0);
		}
		while(*rp++>='0'){
		}
	}
	write(1,"No",2);
	_exit(0);
}