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#include <iostream>
#include <fstream>
#define MAX 1LL<<60
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
long long d[505],dp[505][505],i,s,j,k,N;
int main()
{
fin>>N;
for(i=0;i<=N;i++)
{
fin>>d[i];
}
for(s=1;s<N;s++)
{
for(i=1;i<=N-s;i++)
{
j=i+s;
dp[i][j]=MAX;
for(k=i;k<j;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]<<"\n";
return 0;
}