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#include <fstream>
using namespace std;
ifstream cin("podm.in");
ofstream cout("podm.out");
long long dp[501][501];
long long d[501];
int n;
int main() {
cin >> n;
for(int i=0;i<=n;i++)
cin >> d[i];
for(int di=1;di<n;di++)
for(int i=1;i<=n-di;i++)
{
int j=di+i;
for(int k=i;k<=j-1;k++)
if(!dp[i][j])
dp[i][j]=dp[i][k] + dp[k+1][j] + d[i-1]*d[k]*d[j];
else
dp[i][j]=min(dp[i][j],dp[i][k] + dp[k+1][j] + d[i-1]*d[k]*d[j]);
}
/*for(int i=1;i<=n;i++,cout << '\n')
for(int j=1;j<=n;j++,cout << ' ')
cout << dp[i][j];*/
cout << dp[1][n];
return 0;
}