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#include <iostream>
#include <fstream>
using namespace std;
int n, m[501], dp[502][502];
ifstream fin("podm.in");
ofstream fout("podm.out");
int main()
{
fin >> n;
for(int i = 0; i <= n; i++) fin >> m[i];
for(int i = 1; i <= n; i++)
{
for(int j = 1; j <= n; j++) dp[i][j] = (i == j)? 0 : 1 << 30;
}
for(int i = 1; i < n; i++) dp[i][i + 1] = m[i - 1] * m[i] * m[i + 1];
for(int j = 3; j <= n; j++)
{
for(int i = 1; i <= n - j + 1; i++)
{
for(int k = i; k < j; k++)
dp[i][i + j - 1] = min(dp[i][i + j - 1], dp[i][k] + dp[k + 1][i + j - 1] + m[i-1] * m[k] * m[j]);
}
}
fout << dp[1][n];
}