```cpp
#include <iostream>
#include <algorithm>

using namespace std;

int main() {
    int n;
    cin >> n;
    
    int dp[10][10] = {0}; 
    
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j <= i; ++j) {
            cin >> dp[i][j];
        }
    }
    
    for (int i = n - 2; i >= 0; --i) {
        for (int j = 0; j <= i; ++j) {
            dp[i][j] += max(dp[i+1][j], dp[i+1][j+1]);
        }
    }
    
    cout << dp[0][0] << endl;
    
    return 0;
}