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  1. #include <iostream>
  2. #include <cstdio>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	long long int a, b=1;
  7. 	scanf("%lld", &a);
  8. 	a%=6;
  9. 	while(a>0) {
  10. 		a-=b;
  11. 		b++;
  12. 		if(b==4) b=1;
  13. 	}
  14. 	if(a==0) printf("yes");
  15. 	else printf("no");
  16. 	return 0;
  17. }
Success #stdin #stdout 0s 3300KB
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stdin
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stdout
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yes
https://ideone.com/h9JOWO
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
secret

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