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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("podm.in");
ofstream out("podm.out");
long long dp[502][502], a[502];
int n;
int main()
{
in>>n;
for(int i=1; i<=n+1; i++)
in>>a[i];
for(int i=n; i>=1; i--)
{
for(int j=i; j<=n; j++)
{
if(i!=j)
{
dp[i][j]=1<<30;
for(int k=i; k<j; k++)
{
dp[i][j]=min(dp[i][j], dp[i][k]+dp[k+1][j] + a[i]*a[k+1]*a[j+1]);
}
}
}
}
out<<dp[1][n];
return 0;
}