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  1. // Shaazzz
  2. #include<bits/stdc++.h>
  3. using namespace std;
  4. int main()
  5. {
  6.     long long n, tot = 0, now = 5;
  7.     scanf("%lld", &n);
  8.     while (now <= n)
  9.     {
  10.         tot += (n / now) * (n / now - 1) / 2 * now;
  11.         tot += (n % now + 1) * (n / now);
  12.         now *= 5;
  13.     }
  14.     return !printf("%lld", tot);
  15. }
Success #stdin #stdout 0s 15232KB
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https://ideone.com/A4RJCy
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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