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#include <fstream>
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
long long d[504][504];
int n, i, lung, k, j, a[503];
int main(){
fin>>n;
n++;
for(i=1;i<=n;i++){
fin>>a[i];
}
for(i=1;i<n;i++)
d[i][i+1] = 0;
for(i=3;i<=n;i++){
for(lung=2;i-lung>0;lung++){
j = i-lung;
d[j][i] = LONG_LONG_MAX;
for(k=j+1;k<i;k++)
d[j][i]= min(d[j][i], 1LL*a[j]*a[k]*a[i]+d[j][k]+d[k][i]);
}
}
fout<<d[1][n];
return 0;
}