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  1. //#define _CRT_SECURE_NO_WARNINGS
  2. #include <iostream>
  3. #include<bits/stdc++.h>
  4. #include<fstream>
  5. #include<cstdio>
  6. typedef long long ll;
  7. using namespace std;
  8.  
  9. void winter_is_coming()
  10. {
  11. 	std::ios_base::sync_with_stdio(0);
  12. 	cin.tie(NULL); cout.tie(NULL );
  13. }
  14. void file()
  15. {
  16. #ifndef ONLINE_JUDGE
  17. 	freopen("in.txt", "r", stdin);//freopen("out.txt", "w", stdout);
  18. #endif
  19. }
  20. ll a,b,c,ans=0;
  21. map<ll,ll>mp;
  22. ll getdiv(ll num)
  23. {
  24.     ll div=1;
  25.     if(num==1) return div;
  26.     for(int i=2;i*i<=num;i++)
  27.     {
  28.         if(num%i==0)
  29.         {
  30.             div++;
  31.             if(num%(num/i)==0 && i != num/i) div++;
  32.         }
  33.     }
  34.     div++;
  35.     return div;
  36. }
  37. int main()
  38. {
  39.    winter_is_coming();
  40.  
  41.     cin>>a>>b>>c;
  42.     for(int i=1;i<=a;i++)
  43.     {
  44.         for(int j=1;j<=b;j++)
  45.         {
  46.             for(int k=1;k<=c;k++)
  47.             {
  48.                 if(!mp[i*j*k])
  49.                 {
  50.                     mp[i*j*k]=getdiv(i*j*k);
  51.                 }
  52.                 ans+=(mp[i*j*k]);
  53.                 ans%=1073741824;
  54.             }
  55.         }
  56.     }
  57.     cout<<ans<<"\n";
  58.  
  59.     return 0;
  60. }
  61.  
Success #stdin #stdout 0s 15240KB
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https://ideone.com/AwracP
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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