CS
cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
var answer = Convert.ToInt32(Console.ReadLine());
var mathExpression = Console.ReadLine()?.Split();
var result = "index ";
if (mathExpression != null)
for (var i = 0; i < mathExpression.Length; i++)
{
var res = new DataTable().Compute(mathExpression[i], null);
var num = (int) res;
if (num == answer)
{
result += i.ToString();
}
}
if (result == "index ")
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OUTPUT
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