// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
#include <algorithm>
#include <bitset>
#include <cassert>
#include <climits>
#include <cmath>
#include <complex>
#include <deque>
#include <iomanip>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <string>
#include <tuple>
#include <vector>
using namespace std;
using lg = long long;
using pii = pair<int, int>;
using pll = pair<lg, lg>;
#define TEST cerr << "TEST" << endl
#define AMARI 998244353
//#define AMARI 1000000007
#define TEMOTO ((sizeof(long double) == 16) ? false : true)
#define TIME_LIMIT 1980 * (TEMOTO ? 1 : 1000)
#define el '\n'
#define El '\n'

// 疑似乱数(XorShift)
unsigned long xor128(void) {
    static unsigned long x = 123456789, y = 362436069, z = 521288629, w = 88675123;
    unsigned long t = (x ^ (x << 11));
    x = y;
    y = z;
    z = w;
    return (w = (w ^ (w >> 19)) ^ (t ^ (t >> 8)));
}


#define MULTI_TEST_CASE false
void solve(void) {
    int n;
    cin >> n;
    lg ans = 0;
    vector<lg> a(n);
    for(int i = 0; i < n; i++){
        cin >> a[i];
        if(i != n -1)ans += a[i];
    }
    ans += a.back() % a[0];
    for(int i = 1; i < n - 1; i++){
        lg temp = ans;
        temp -= a[i - 1] % a[i];
        temp -= a[i] % a[i + 1];
        temp -= a[n - 1] % a[0];

        temp += a[i - 1] % a[i + 1];
        temp += a[n - 1] % a[i];
        temp += a[i] % a[0];
        ans = max(ans,temp);
    }
    cout << ans << el;
    return;
}

void calc(void) {
    int n = 5;
    vector<int> a(n);
    
    for(int i = 0; i < n; i++){
        if(i == 0)a[i] = xor128() % 2 + 1;
        else{
            a[i] = a[i - 1] + xor128() % 10 + 1;
        }
    }
    
    cout << "a = {";
    for(int i = 0; i < n; i++){
        if(i)cout << ',';
        cout << a[i];
    }
    cout << "}\n";
    lg ans = 0;
    vector<int> tempv;
    int cnt = 0;
    do{
        lg temp = 0;
        for(int i = 0; i < n - 1; i++){
            temp += a[i] % a[i + 1];
        }
        temp += a.back() % a[0];
        if(temp > ans){
            ans = temp;
            tempv = a;
            cnt = 1;
        }
        if(temp == ans)cnt++;
    }while(next_permutation(a.begin(),a.end()));
    cout << ans << el;
    cout << cnt << el;
    for(int i = 0; i < n; i++)cout << tempv[i] << ' ';
    cout << el;
    cout << el;

    return;
}

int main(void) {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    /*
    
    for(int i = 0; i < 100; i++){
        calc();
    }
    */
    int t = 1;
    if(MULTI_TEST_CASE) cin >> t;
    while(t--) {
        solve();
    }
    return 0;
}