#include <stdio.h>
#define max 502
#define inf 0x3f3f3f3f
long long m[max][max],d[max];
int n,i,j,k,nr;
int main()
{
    freopen("podm.in","r",stdin);
    freopen("podm.out","w",stdout);
    scanf("%d",&n);
    for(i=1; i<=n+1; i++) scanf("%lld",&d[i]);

    for(nr=2; nr<=n; nr++)
     for(i=1; i<=n-nr+1; i++)
     {
         j=i+nr-1;
         m[i][j]=inf;
         for(k=i; k<j; k++)
          if(m[i][j]>m[i][k]+m[k+1][j]+d[i]*d[k+1]*d[j+1])
          {
              m[i][j]=m[i][k]+m[k+1][j]+d[i]*d[k+1]*d[j+1];
          }
     }
    printf("%lld",m[1][n]);
    return 0;
}