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#include <fstream>
#define INF 1000000000
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int n,i,v[505],D[505][505],d,j,k;
int main(){
fin>>n;
for(i=1;i<=n+1;i++){
fin>>v[i];
}
n++;
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[j]*v[k]);
}
}
}
fout<<D[1][n];
return 0;
}