func_code_string: #include <bits/stdc++.h>   using namespace std;   const int INF = 1000000000;   const long long LINF = 4000000000000000000LL;   const double eps = 1e-9;   void prepare() {}   int a, n;   int day[10000008];   void read() { scanf( %d%d , &a, &n); }   void solve() {     read();     for (int i = 1; i * i < a + n; i++) {       int ii = i * i;       for (int j = ii; j < a + n; j += ii) day[j] = i * i;     }     long long res = 0;     for (int i = a; i < a + n; i++) res += i / day[i];     cout << res << endl;   }   int main() {     prepare();     solve();     return 0;   }   