#include <bits/stdc++.h>
using namespace std;
int t[10], card[105];
int main() {
  int i, sum, ans;
  sum = 0;
  for (i = 1; i <= 5; i++) {
    cin >> t[i];
    sum = sum + t[i];
    card[t[i]]++;
  }
  ans = sum;
  for (i = 100; i >= 1; i--) {
    if (card[i] == 2) {
      if (sum - 2 * i < ans) ans = sum - 2 * i;
    }
    if (card[i] >= 3) {
      if (sum - 3 * i < ans) ans = sum - 3 * i;
    }
  }
  cout << ans << endl;
  return 0;
}
