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#include <cstdio>
#include <algorithm>
using namespace std;
const long long inf=10000000000000000;
long long d[510][510];
int v[510];
int main()
{
freopen("podm.in", "r", stdin);
freopen("podm.out", "w", stdout);
int n;
scanf("%d",&n);
for(int i=0;i<=n;i++) scanf("%d",&v[i]);
for(int i=1;i<=n;i++)
for(int j=i+1;j<=n;j++) d[i][j]=inf;
for(int step=2;step<=n;step++)
for(int i=1,j=step;j<=n;i++,j++)
for(int k=i;k<j;k++) d[i][j]=min(d[i][j],d[i][k]+1LL*v[i-1]*v[k]*v[j]+d[k+1][j]);
printf("%lld",d[1][n]);
return 0;
}