#include <stdio.h>

struct _block{ 
	int L, R; 
public:
	static int M; 
}; 
int _block::M = 0; 

bool is_yes(int const N, _block *block, int *tau){
	int tau_id = N, T = -1; 
	int min_L = _block::M, min_id = tau_id, temp = 0, i = 0; 
	bool isTurn = false; 
	_block *p = NULL; 
	while(0 < tau_id){ 
		min_L = _block::M; min_id = tau_id; temp = 0; 
		isTurn = false; 
		for(i = 0; i < tau_id; ++i){
			p = block + tau[i]; 
			if(T < (temp = p->L                ) && min_L > temp){ min_L = temp; min_id = i; isTurn = false; }
			if(T < (temp = _block::M - 1 - p->R) && min_L > temp){ min_L = temp; min_id = i; isTurn = true ; }
		}
		if(tau_id == min_id){ return false; }
		if(!isTurn){ T = block[tau[min_id]].R; }else{ T = _block::M - 1 - block[tau[min_id]].L; }
		tau[min_id] = tau[tau_id - 1]; --tau_id; 
	}
	return true; 
}

int main(int argc, char *argv[]){
	_block block[2002]; 
	int tau[2002]; 
	int N = 0; 
	scanf("%d%d", &N, &_block::M);
	for(int k = 0; k < N; ++k){ tau[k] = k; scanf("%d%d", &block[k].L, &block[k].R); }

	printf("%s\n", ((is_yes(N, block, tau))? "YES" : "NO")); 
	return 0;
}