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  1. #include <bits/stdc++.h>
  2. #define ll long long
  3. #define mod 1073741824
  4. #define con 1000050
  5. using namespace std;
  6. ll cntr[con] = {0};
  7. void sieveeeeeee() {
  8.     for (int s = 1; s < con; ++s)
  9.         for (int x = s  ; x < con; x += s)
  10.             cntr[x]++;
  11. }
  12. void solve() {
  13.     int a , b , c;
  14.     cin >> a >> b >> c;
  15.     ll sumx = 0 ;
  16.     for ( int i = 1 ; i <= a ; i++ )
  17.         for ( int j = 1 ; j <= b ; j++ )
  18.             for (int k = 1 ; k <= c ; k++ )
  19.                 sumx +=  cntr[i * j * k];
  20.     sumx %= mod;
  21.     cout << sumx;
  22. }
  23. int main() {
  24.     sieveeeeeee();
  25.     solve();
  26.     return 0;
  27. }
Success #stdin #stdout 0.04s 11356KB
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https://ideone.com/sVcYxE
language:
C++ (gcc 8.3)
created:
10 hours ago
visibility:
public

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