#include <bits/stdc++.h>
using namespace std;
#define overload3(_NULL, _1, _2, name, ...) name
#define rep1(i, n) for (remove_const_t<remove_reference_t<decltype(n)>> i = 0; i < (n); i++)
#define rep2(i, a, b) for (remove_const_t<remove_reference_t<decltype(a)>> i = a; i < (b); i++)
#define rep(...) overload3(__VA_ARGS__, rep2, rep1)(__VA_ARGS__)
#if __has_include(<debug.hpp>)
#    include <debug.hpp>
#else
#    define dbg(...) (void(0))
#endif
template<class T> void drop(const T &x) {
    cout << x << "\n";
    exit(0);
}
template<class T> bool chmax(T &a, const T &b) { return a < b and (a = b, true); }
template<class T> bool chmin(T &a, const T &b) { return a > b and (a = b, true); }
using i64 = long long;
using usize = size_t;

int main() {
    usize n;
    cin >> n;
    vector<usize> p(n);
    for (auto &&pi: p) cin >> pi;
    usize ans = 0;
    set<usize> remain{};
    rep(i, n) remain.insert(i + 1);
    for (usize i = n; i--;) {
        auto it = remain.upper_bound(p[i]);
        if (it == end(remain)) {
            if (p[i] != *begin(remain)) ans -= i + 1;
            remain.erase(*begin(remain));
        } else {
            remain.erase(*it);
            ans += i + 1;
        }
    }
    cout << ans << "\n";
}

struct IOSetup {
    IOSetup() noexcept {
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
        cout << fixed << setprecision(10);
        cerr << fixed << setprecision(10);
    }
} iosetup;