n, m=gets.split.map(&:to_i) a=Array.new(n){0} m.times do diff=gets.split.map(&:to_i) a=a.zip(diff).map{|cur, d| cur+d} n.times do |i| s=0 (i...n).each do |j| if (s+=a[j])==777 puts 'YES'; exit 0 elsif s>777 break end end end end puts 'NO'