tuki2501

MATONG.cpp

Nov 25th, 2021
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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. typedef long long ll;
  5.  
  6. const int N = 1000001;
  7.  
  8. int cnt[N];
  9.  
  10. signed main() {
  11.   for (int i = 1; i < N; i++)
  12.   for (int j = i; j < N; j += i) {
  13.     cnt[j]++;
  14.   }
  15.   int n; cin >> n;
  16.   ll ans = 0;
  17.   for (int i = 1; i <= n; i++) {
  18.     int x; cin >> x;
  19.     ans += x * cnt[x];
  20.   }
  21.   cout << ans << '\n';
  22. }
  23.  
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