#include <bits/stdc++.h>

using namespace std;

#if 1
    #define pv(x) cout<<#x<<" = "<<x<<"; ";cout.flush()
    #define pn cout<<endl
#else
    #define pv(x)
    #define pn
#endif

#ifdef ONLINE_JUDGE
    #define in cin
    #define out cout
#else
    ifstream in("podm.in");
    ofstream out("podm.out");
#endif

using ll = long long;
using ull = unsigned long long;
using ui = unsigned int;
#define pb push_back
#define mp make_pair
const int NMax = 5e2 + 5;
const ll inf_ll = 1e18 + 5;
const int inf_int = 1e9 + 5;
const int mod = 100003;
using zint = int;

ll N;
ll dim[NMax],dp[NMax][NMax];

int main() {
    in >> N;
    for (int i = 1;i <= N + 1;++i) {
        in >> dim[i];
    }
    
    for (int nr = 2;nr <= N;++nr) {
        for (int i = 1;i + nr - 1 <= N;++i) {
            int j = i + nr - 1;
            
            dp[i][j] = inf_ll;
            for (int k = i;k < j;++k) {
                ll val = dp[i][k] + dp[k+1][j] + dim[i] * dim[k+1] * dim[j+1];
                dp[i][j] = min(dp[i][j],val);
            }
        }
    }
    
    out << dp[1][N];

    return 0;
}