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#include <iostream>
#include <fstream>
#include <bits/stdc++.h>
#define VMAX 505
using namespace std;
ifstream fin ("podm.in");
ofstream fout ("podm.out");
const long long int INF = 1e18;
long long int dp[VMAX][VMAX];
long long int numere[VMAX];
struct matrix{
long long int lin,col;
};
matrix nrr[VMAX];
int main()
{
ios_base::sync_with_stdio(0);
long long int n,m,i,j,k,t,q,nr,maxim,minim,suma;
fin>>n;
for(i=0;i<=n;i++)
fin>>numere[i];
for(i=0;i<=n;i++)
{
nrr[i].lin=numere[i];
nrr[i].col=numere[i+1];
}
for(i=0;i<=n;i++)
for(j=0;j<=n;j++)
dp[i][j]=INF;
for(i=n-1;i>=0;i--)
{
dp[i][i]=0;
dp[i][i+1]=nrr[i].lin * nrr[i].col * nrr[i+1].col;
for(j=i+2;j<n;j++)
{
for(k=i;k<j;k++)
{
dp[i][j]=min(dp[i][k]+dp[k+1][j]+nrr[i].lin*nrr[k].col*nrr[j].col,dp[i][j]);
}
}
}
fout<<dp[0][n-1]<<'\n';
return 0;
}