#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();
	long s=(long)rd()*rd();
	long h=rd();
	repeat(n-1){
		long t=rd();
		if(t>h){
			if(t>h+s){
				write(1,"No",2);
				_exit(0);
			}
			h=t;
		}
	}
	write(1,"Yes",3);
	_exit(0);
}