#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,b[100000]={};
    cin>>a;
    for(int i=0;i<a;i++)
    {
        string c;cin>>c;int s=0;
        for(int j=0;j<c.length();j++)s+=c[j]-48;
        b[i]=s;
    }
    sort(b,b+a);
    cout<<b[a-1];
}

C++ :

#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main() {
    int n;
    cin >> n;
    int x = 0;
    for (int i = 0; i < n; i++) {
        int smu = 0;
        ll tmp;
        cin >> tmp;
        while (tmp > 0) {
            smu += tmp % 10;
            tmp /= 10;
        }
        x = max(x, smu);
    }
    cout << x << endl;
    return 0;
}