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#include <bits/stdc++.h>
#define DIM 510
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int n;
long long d[DIM][DIM], v[DIM];
int i, j, k, len;
int main(){
fin>>n;
n++;
for(i=1; i<=n; i++)
fin>>v[i];
for(len=3; len<=n; len++){
for(i=1; i+len-1<=n; i++){
j=i+len-1;
d[i][j]=LONG_MAX;
for(k=i+1; k<j; k++){
d[i][j]=min(d[i][k]+d[k][j]+v[i]*v[j]*v[k], d[i][j]);
}
}
}
fout<<d[1][n];
}