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#include <bits/stdc++.h>
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
const long long inf = 1e18;
int d[505];
long long dp[505][505];
int main()
{
int n,i,j,e,k;
fin >> n;
fin >> d[0] >> d[1];
for(i = 2; i <= n; i++){
fin >> d[i];
dp[i - 1][i] = d[i - 2] * d[i - 1] * d[i];
}
for(e = 2; e < n; e++){
for(i = 1; i <= n - e; i++){
dp[i][i + e] = inf;
for(k = i; k < i + e; k++)
dp[i][i + e] = min(dp[i][i + e], dp[i][k] + dp[k + 1][i + e] + 1LL * d[i - 1] * d[k] * d[i + e]);
}
}
fout << dp[1][n];
return 0;
}