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#include <fstream>
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int n, i, j, k, l;
long long v[510], d[510][510];
int main(){
fin>>n;
n++;
for(i=1; i<=n; i++){
fin>>v[i];
}
for(l=3; l<=n; l++){
for(i=1; i+l-1<=n; i++){
j=i+l-1;
d[i][j]=1000000000;
for(k=i+1; k<j; k++){
d[i][j]=min(d[i][j], d[i][k]+d[k][j]+v[i]*v[k]*v[j]);
}
}
}
fout<<d[1][n];
}