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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n, m;
  6. 	cin >> n >> m;
  7. 	int a = n / 5;
  8. 	int b = m / 5;
  9. 	long long ans = 5  * a * b;
  10. 	int as = n % 5;
  11. 	int bs = m % 5;
  12. 	for(int i = 1; i <= as; i++) {
  13. 		for(int j = 1; j <= bs; j++) {
  14. 			if((i + j) % 5 == 0) ans++;
  15. 		}
  16. 	}
  17. 	cout << ans + as * b + bs * a << endl;
  18. 	//1 2 3 4 0 1 2 3 4 0 1 
  19. 	//1 2 3 4 0 1 2 3 4 0 1 2 3 4
  20. 	return 0;
  21. }
Success #stdin #stdout 0s 3460KB
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6 12
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14
https://ideone.com/yZIYPU
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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