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#include <fstream>
#include <algorithm>
#include <climits>
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
int n;
long long dp[505][505];
int d[505];
int main()
{
f>>n;
for(int i=0; i<=n; i++)
f>>d[i];
for(int adaug=1; adaug<n; adaug++)
for(int i=1; i+adaug<=n; i++){
int j=i+adaug;
long long vmin=LLONG_MAX;
for(int k=i; k<=j-1; k++)
vmin=min(dp[i][k] + dp[k+1][j] + 1LL*d[i-1]*d[k]*d[j], vmin);
dp[i][j]=vmin;
}
g<<dp[1][n];
return 0;
}