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#include <fstream>
#define inf 1LL<<60
using namespace std;
ifstream in("podm.in");
ofstream out("podm.out");
long long n, m, i, j, k, ok ,minim, maxim;
long long D[505][505], v[505], d, INF;
int main(){
in>>n;
n++;
for(i=1; i<=n; i++)
in>>v[i];
for(i=1; i<=n-1; i++)
D[i][i+1]=0;
for(d=2; d<=n-1; d++){
for(i=1; i+d<=n; i++){
j=i+d;
D[i][j]=inf;
for(k=i+1; k<=j-1; k++)
D[i][j]=min(D[i][j], D[i][k]+D[k][j]+v[i]*v[k]*v[j]);
}
}
out<<D[1][n];
return 0;
}