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#include <bits/stdc++.h>
#define inf 1000000000000000LL
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
long long best[505][505];
long long d[505];
int n;
int main()
{
fin>>n;
for(int i=0;i<=n;++i)
fin>>d[i];
for(int i=1;i<n;++i)
best[i][i+1]=d[i-1]*d[i]*d[i+1];
for(int i=2;i<n;++i)
for(int j=1;j<=n-i;++j)
{ best[j][j+i]=inf;
for(int k=j;k<i+j;++k)
best[j][j+i]=min(best[j][j+i],best[j][k]+best[k+1][j+i]+d[j-1]*d[k]*d[i+j] );
}
fout<<best[1][n];
return 0;
}