func_code_string: #include <bits/stdc++.h>   using namespace std;   int a, b, c;   unsigned long ans = 0;   unordered_map<int, int> um;   void eval(int x) {     int t = 0;     for (int i = 1; i <= sqrt(x); ++i) {       if (i * i == x)         t += 1;       else if (x % i == 0)         t += 2;     }     ans += t;     um[x] = t;   }   int main() {     cin >> a >> b >> c;     for (int i = 1; i <= a; ++i) {       for (int j = 1; j <= b; ++j) {         for (int k = 1; k <= c; ++k) {           if (um.find(i * j * k) != um.end())             ans = (ans + um[i * j * k]) % 1073741824LL;           else             eval(i * j * k);         }       }     }     cout << ans << endl;   }   