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Jan 16th, 2018
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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main()
  4. {
  5. ios_base::sync_with_stdio(0);
  6. cin.tie(0);
  7. cout.tie(0);
  8. int a,b,wyn1,wyn2,w;
  9. cin>>a>>b;
  10. for(int i=2;i<=1000;i++)
  11. {
  12. a/=__gcd(a,i);
  13. if(a==1)
  14. {
  15. wyn1=i;
  16. break;
  17. }
  18. }
  19. if(a!=1)wyn1=a;
  20. for(int i=2;i<=1000;i++)
  21. {
  22. b/=__gcd(b,i);
  23. if(b==1)
  24. {
  25. wyn2=i;
  26. break;
  27. }
  28. }
  29. if(b!=1)wyn2=b;
  30. if(wyn1<wyn2)cout<<wyn1<<"\n";
  31. else cout<<-1<<"\n";
  32. }
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