#include <stdio.h>
#define INF 1000000000000000LL
#define MIN(a,b) a<b?a:b
typedef long long i64;
i64 bst[501][501];
unsigned int d[501],n,i,j,k,w,c;
int main(){
    FILE *f=fopen("podm.in","r");
    FILE *g=fopen("podm.out","w");
    fscanf(f,"%d",&n);
    for(i=0;i<=n;++i)
        fscanf(f,"%d",&d[i]);
    for(i=1;i<=n;++i)
        bst[i][i]=0;
    for(i=1;i<n;++i)
        bst[i][i+1]=d[i-1]*d[i]*d[i+1];
    for(w=2;w<=n;++w){
        for(i=1;i<=n-w;++i)
            j=i+w;
            bst[i][j]=INF;
            for(k=i;k<=j-1;++k)
                bst[i][j]=MIN(bst[i][j],bst[i][k]+bst[k+1][j]+d[i-1]*d[k]*d[j]);
                }
    fprintf(g,"%lld\n",bst[1][n]);
    return 0;
    }