#include <iostream>
using namespace std;
int digit_sum(long long x) {
int sum = 0;
while (x > 0) {
sum += x % 10;
x /= 10;
}
return sum;
}

int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);

int n;
cin >> n;
int max_sum = 0;
while (n--) {
long long a;
cin >> a;
max_sum = max(digit_sum(a), max_sum);
}
cout << max_sum << endl;
return 0;
}