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#include<iostream>
#include<fstream>
#include<cmath>
#define oo 100000000
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
int dp[505][505], d[505];
int n;
void citire()
{
f>>n;
for(int i=0; i<=n; i++)
f>>d[i];
}
void dinam()
{
int pas,i,j,k;
for(i=1;i<=n;i++)
for(j=i;j<=n;j++)
dp[i][j]=oo;
for(i=1;i<=n;i++)
dp[i][i]=0;
for(pas=1; pas<n; pas++)
for(i=1; i<=n-pas; i++){
j = i + pas;
for(k=i; k<j; k++)
dp[i][j] = min(dp[i][j], dp[i][k] + dp[k+1][j] + d[i-1]*d[k]*d[j]);
}
g<<dp[1][n]<<"\n";
}
int main()
{
citire();
dinam();
return 0;
}