fun main(args: Array<String>) { 
  val (ws, n) = readLine()!!.split(" ").map { it.toInt() }
  val xs = (1..ws).map { 0 }.toMutableList()
  
  var check = false
  (1..n).map { 
    readLine()!!.split(" ").map { it.toInt() }.mapIndexed { index, x ->
      xs[index] += x

      for( s in (0..xs.size -1) ) { 
        for( e in (s+1..xs.size - 1) ) { 
          if( xs.slice(s..e).sum() == 777) {
            check = true
          }
        }
      }
    }
  }

  if(check) 
    println("YES")
  else
    println("NO")
}