def main():
    N, M = map(int, input().split())
    T = 0
    P = 0
    for i in range(M):
        temp_T, temp_P = map(int, input().split())
        if abs(temp_P - P) > (temp_T - T):
            print('No')
        else:
            print('Yes')
            break

if __name__ == '__main__':
    main()