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#include <bits/stdc++.h>
#define int long long
using namespace std;
#ifndef LOCAL
string name="podm";
ifstream in(name+".in");
ofstream out(name+".out");
#define cin in
#define cout out
#endif //LOCAL
const int MN = 505;
const int MV = (1ll<<60);
int v[MN];
int d[MN][MN];
int n;
int32_t main()
{
cin>>n;
for(int i=1;i<=n+1;i++)
{
cin>>v[i];
}
for(int k=1;k<=n;k++)
{
for(int i=1;i+k<=n;i++)
{
int j=i+k;
d[i][j]=MV;
for(int y=i;y<j;y++)
{
d[i][j]=min(d[i][j], d[i][y]+d[y+1][j]+v[i]*v[y+1]*v[j+1]);
}
}
}
cout<<d[1][n];
return 0;
}