public class Solution {
    public int LargestPerimeter(int[] A) {

        Array.Sort(A);

        for(int i = A.Length-1; i >= 2; i--){
            if(A[i-1] + A[i-2] > A[i])
                return A[i] + A[i-1] + A[i-2];
        }

        return 0;
    }
}