#include<iostream>
using namespace std;
int main(){
    long long n;
    cin >> n;
    long long arr[n];
    long long arr2[n];
    for(long long i = 0;i < n;i++){
        arr[i] = 0;
    }
    for(long i = 0;i < n;i++){
        cin >> arr[i];
        while(arr[i]){
            arr2[i] += arr[i] % 10;
            arr[i] /= 10;
        }
    }
    long long max = arr2[0];
    for(long long i = 1;i < n;i++){
        if(max < arr2[n]){
            max = arr2[n];
        }
    }
    cout << max;
    return 0;
}