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#include <fstream>
#include <algorithm>
using namespace std;
long long mnm,n,d[505],dp[505][505];
int j;
int main()
{
ifstream fin("podm.in");
ofstream fout("podm.out");
fin>>n;
for(int i=0;i<=n;i++)
fin>>d[i];
for(int l=2;l<=n;l++)
for(int i=1;i<=n-l+1;i++)
{
j=i+l-1;
mnm=4223372036854775807;
for(int k=i;k<j;k++)
mnm=min(mnm,dp[i][k]+dp[k+1][j]+d[i-1]*d[k]*d[j]);
dp[i][j]=mnm;
}
fout<<dp[1][n];
return 0;
}