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Dec 12th, 2019
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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7. long long a,b,l=0;
  8. cin >>a>>b;
  9. for (int i=a;i<b+1;i++)
  10. {
  11. int k=0;
  12. for (int j=2;j<=sqrt(i);j++)
  13. {
  14. if (i%j==0)
  15. {
  16. k++;
  17. }
  18. }
  19. if (k==0)
  20. {
  21. //cout <<i;
  22. int lol=i;
  23. while(lol!=0)
  24. {
  25. if(lol%100==13)
  26. {
  27. break;
  28. }
  29. lol/=100;
  30. }
  31. }
  32. }
  33. cout <<l;
  34. }
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