func main() var n: int :: cui@inputInt() var m: int :: cui@inputInt() var a: []int :: #[n]int for(1, m) for i(0, n - 1) do a[i] :+ cui@inputInt() end for var l: int :: 0 var r: int :: 0 var sum: int :: 0 while(r < n) if(sum < 777) do sum :+ a[r] do r :+ 1 else do sum :- a[l] do l :+ 1 end if if(sum = 777) do cui@print("YES\n") ret end if end while end for do cui@print("NO\n") end func