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#include<fstream>
#define INF 1000000000000000000
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
long long min(long long a,long long b){
if(a<b){
return a;
}else
return b;
}
int n,i,d,j,k;
long long a[550][550],v[550];
int main(){
fin>>n;
n++;
for(i=1;i<=n;i++){
fin>>v[i];
}
for(d=2;d<=n-1;d++){
for(i=1;i+d<=n;i++){
j=d+i;
a[i][j]=INF;
for(k=i+1;k<j;k++){
a[i][j]=min(a[i][j],a[i][k]+a[k][j]+v[i]*v[k]*v[j]);
}
}
}
fout<<a[1][n];
return 0;
}