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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int n, ii;
long long v[505];
long long d[505][505];
int main(){
fin>>n;
for(int i=0; i<=n; i++)
fin>>v[i];
for(int i=1; i<=n-1; i++)
d[i][i + 1] = v[i - 1] * v[i] * v[i + 1];
for(int j=2; j<=n; j++)
for(int i=1; i<=n-j; i++){
ii=i+j;
d[i][ii] = d[i][i] + d[i + 1][ii] + 1LL * v[i - 1] * v[i] * v[ii];
for(int k=i+1; k<=j; k++)
d[i][ii]=min(d[i][ii], d[i][k] + d[k + 1][ii] + 1LL * v[i - 1] * v[k] * v[ii]);
}
fout<<d[1][n];
return 0;
}