#include "stdio.h"
const long INF=1000000000LL;
const int MAXN = 505;
typedef long long LLong;
LLong Min(LLong a, LLong b){
	if(a<b)
		return a;
	return b;
}
int main(){
	FILE *f;
	LLong M[MAXN][MAXN],d[MAXN];
	LLong n;
	int i,j,k,m;
	f = fopen("podm.in","r");
	fscanf(f,"%lld",&n);
	for(i=0;i<=n;++i)
		fscanf(f,"%lld",&d[i]);
	fclose(f);
	for(i=1;i<=n;++i)
		M[i][i] = 0;
	for(i=1;i<=n-1;++i)
		M[i][i+1] = d[i-1]*d[i]*d[i+1];
	for(i=2;i<=n-1;++i)
		for(j=1;j<=n-i;++j){
			m = j+i;
			M[j][m] = INF;
			for(k=j;k<=m-1;++k)
				M[j][m] = Min(M[j][m],M[j][k] + M[k+1][m] + d[j-1]*d[k]*d[m]);
		}
	f = fopen("podm.out","w");
	fprintf(f,"%lld \n",M[1][n]);
	return 0;
}