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- nakov/////////////////////////////////////////////////////////////////////////////////////
- BigInteger t1 = long.Parse(Console.ReadLine());
- BigInteger t2 = long.Parse(Console.ReadLine())
- BigInteger t3 = long.Parse(Console.ReadLine());
- int n = int.Parse(Console.ReadLine());
- BigInteger tn = 0;
- if (n == 1)
- {
- Console.WriteLine(1);
- }
- else if (n == 2)
- {
- Console.WriteLine(2);
- }
- else if (n == 3)
- {
- Console.WriteLine(3);
- }
- else
- {
- for (int i = 4; i <= n; i++)
- {
- tn = t1 + t2 + t3;
- t1 = t2;
- t2 = t3;
- t3 = tn;
- }
- }
- Console.WriteLine(tn);
- }
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