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#include <bits/stdc++.h>
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
long long n, d[501], dp[501][501];
int main()
{
fin >> n;
for(int i = 0; i <= n; i++)
fin >> d[i];
for(int i = 1; i <= n - 1; i++)
dp[i][i + 1] = d[i - 1] * d[i] * d[i + 1];
for(int l = 3; l <= n; l++)
{
for(int i = 1; i <= n - l + 1; i++)
{
int j = i + l - 1;
dp[i][j] = LONG_LONG_MAX;
for(int k = i; k <= j - 1; k++)
{
dp[i][j] = min(dp[i][j], dp[i][k] + dp[k + 1][j] + d[i - 1] * d[k] * d[j]);
}
}
}
fout << dp[1][n];
return 0;
}