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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int maxPowerOf(int p, int n)
  5. {
  6.     int k = 0;
  7.     int powerOfP = 1;
  8.     while (true)
  9.     {
  10.         powerOfP *= p;
  11.         int addend = n / powerOfP;
  12.         if (addend == 0)
  13.             return k;
  14.         k += addend;
  15.     }
  16. }
  17.  
  18. int main() {
  19. int n = 0;
  20. cin >> n;
  21. int p5 = maxPowerOf(5, n);
  22. cout << (p5/2) << '\n';
  23. }
Success #stdin #stdout 0s 3472KB
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stdin
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1000000000
stdout
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124999999
https://ideone.com/IlESLp
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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