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C# code:

public static double getNum(int i)
{
if (i < 0) return -1;
if (i < 3) return 0;
if (i == 3) return 1;
double m = 0;
double result = 1;
int temp = 3;
double head = 0;
double mid = 0;
double end = 1;
while (temp < i)
{
head += mid + end;
m = head;
head = mid;
mid = end;
end = m;
result += Math.Sqrt(end);
temp++;
}
return result;
}



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