#include <bits/stdc++.h>

using namespace std;

const long long inf=10000000000000000;
long long v[510],d[510][510];

int main()
{
    freopen("podm.in", "r", stdin);
    freopen("podm.out", "w", stdout);
    int n;
    scanf("%d",&n);
    for(int i=1;i<=n+1;i++) scanf("%lld",&v[i]);
    for(int l=2;l<=n;l++)
        for(int i=1,j=l;j<=n;i++,j++)
        {
            d[i][j]=inf;
            for(int k=i;k<j;k++)
                d[i][j]=min(d[i][j],d[i][k]+d[k+1][j]+v[i]*v[k+1]*v[j+1]);
        }
    printf("%lld",d[1][n]);
    return 0;
}