OIG VI - apt

// https://szkopul.edu.pl/problemset/problem/mZDGm1hDFvHQwi1VEXmkuIZs/site/?key=statement

#include <iostream>
#include <vector>

int main() {
    std::ios_base::sync_with_stdio(0);
    std::cin.tie(0);
    std::cout.tie(0);

    int n;
    std::cin >> n;

    std::vector<int> v(n);

    for (int i = 0; i < n; i++) {
        std::cin >> v[i];
    }

    int local_min = v[v.size() - 1];
    for (int i = v.size() - 1; i >= 0; i--) {
        local_min = std::min(local_min, v[i]);
        v[i] = local_min;
    }

    long long sum = 0;

    for (int i = 0; i < v.size(); i++) {
        sum += v[i];
    }

    std::cout << sum << '\n';

    return 0;
}