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#include <bits/stdc++.h>
using namespace std;
#define cin f
#define cout g
#define NMAX 1010
ifstream f("podm.in");
ofstream g("podm.out");
long long int dp[NMAX][NMAX], dim[NMAX], n, mn=NMAX;
char s1[NMAX], s2[NMAX];
int main()
{
cin>>n;
for(int i=1;i<=n+1;i++)
{
cin>>dim[i];
}
for(int p=1;p<n;p++)
{
for(int i=1;i<=n-p;i++)
{
mn=1000000;
int j=p+i;
if(j>n)
j=n;
for(int k=i;k<j;k++)
{
dp[i][j]=dp[i][k]+dp[k+1][j]+dim[i]*dim[k+1]*dim[j+1];
mn=min(mn, dp[i][j]);
}
dp[i][j]=mn;
}
}
cout<<(dp[1][n]);
return 0;
}