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- using System;
- using System.Numerics;
- class SimpleLoops
- {
- static void Main()
- {
- BigInteger t1 = int.Parse(Console.ReadLine());
- BigInteger t2 = int.Parse(Console.ReadLine());
- BigInteger t3 = int.Parse(Console.ReadLine());
- BigInteger n = int.Parse(Console.ReadLine());
- BigInteger Tn = t3 + t2 + t1;
- if (n < 4)
- {
- if (n == 1)
- {
- Tn = t1;
- }
- else if (n == 2)
- {
- Tn = t2;
- }
- else
- {
- Tn = t3;
- }
- }
- else
- {
- for (int i = 4; i < n; i++)
- {
- t1 = t2;
- t2 = t3;
- t3 = Tn;
- Tn = t3 + t2 + t1;
- }
- }
- Console.WriteLine(Tn);
- }
- }
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