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#include <fstream>
#include <vector>
#include <map>
#include <set>
#include <algorithm>
using namespace std;
ifstream cin ("podm.in");
ofstream cout ("podm.out");
long long int n,k,i,j,l,r,mij,a[100005],nr,sum,b,c,d,bbit,cbit,dbit,dp[1005][1005],maxi,x,ok;
string s1,s2;
set<int> q;
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cin>>n;
for(i=0; i<=n; i++)
cin>>a[i];
for(i=0; i+2<=n; i++)
dp[i][i+2]=a[i]*a[i+1]*a[i+2];
for(l=3; l<=n; l++)
for(i=0; i+l<=n; i++)
{
j=i+l;
dp[i][j]=1e18;
for(k=i; k<=j; k++)
{
dp[i][j]=min(dp[i][j], dp[i][k]+dp[k][j]+a[i]*a[j]*a[k]);
}
}
cout<<dp[0][n];
return 0;
}