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#include <fstream>
#define inf 2000000000000
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
long long n,i,v[510],l,j,k,D[510][510];
int main(){
fin>>n;
n++;
for(i=1;i<=n;i++)
fin>>v[i];
for(i=1;i<n;i++)
D[i][i+1];
for(l=3;l<=n;l++){
for(i=1;i+l-1<=n;i++){
j=i+l-1;
D[i][i+l-1]=inf;
for(k=i+1;k<j;k++)
D[i][j]=min(D[i][k]+D[k][j]+v[i]*v[k]*v[j],D[i][j]);
}
}
fout<<D[1][n];
return 0;
}