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  1. #include <iostream>
  2.  
  3. int main()
  4. {
  5.   unsigned K;
  6.   std::cin >> K;
  7.  
  8.   unsigned long long n = 0;
  9.   --K;
  10.  
  11.   for (unsigned long long a = 0, b = 0, c = 1; K > 0; --K, a = b, b = c, c = n)
  12.      n = a + b + c;
  13.  
  14.   std::cout << n << std::endl;
  15. }
  16.  
Success #stdin #stdout 0s 15232KB
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https://ideone.com/gqLjIY
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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