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#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);

    int n, a;
    cin >> n;
    
    vector<int> ve;

    for(int i=1; i<=n; ++i)
    {
        for(int j=0; j<i; ++j)
        {
            cin >> a;
            ve.push_back(a);
        }
    }

    sort(ve.begin(), ve.end());

    int out = 0;
    for(int i=0; i<n; ++i)
    {
        out += ve[i];
    }

    cout << out << endl;

    return 0;
}