#include <bits/stdc++.h>//9178
using namespace std;//7891
int a[100005] , b[100005];//收着呗
int shu(int x)
{
int cnt = 0;
while(x != 0)
{
cnt += x % 10;
x /= 10;
}
return cnt;
}
int main()
{
int n;
cin >> n;
int maxn = -1e9;
for(int i = 1 ; i <= n ; i++)
{
cin >> a[i];
b[i] = shu(a[i]);
}
for(int i = 1 ; i <= n ; i++)
{
maxn = max(maxn , b[i]);
}
cout << maxn << " ";
return 0;
}
