#include <bits/stdc++.h> 
using namespace std; 
int main() { 
    int n,num,sum,maxx = 0;
    cin >> n;
    while (n--) {
    	cin >> num;
    	sum = 0;
    	while (num != 0){
    		sum += num % 10;
    		num /= 10;
		}
        if (sum > maxx) { 
            maxx = sum;
        }
	}
    cout<<maxx;
    return 0;
}